regul ec european parliament council octob relat fertilis european parliament council european union regard treati establish european commun articl thereof regard propos commiss regard opinion european econom social committe act accord procedur laid articl treati council direct eec decemb approxim law member state relat fertilis council direct eec juli approxim law member state relat straight ammonium nitrat fertilis high nitrogen content commiss direct eec decemb approxim law member state relat procedur control characterist limit resist deton straight ammonium nitrat fertilis high nitrogen content commiss direct eec june approxim law member state relat method sampl analysi fertilis substanti amend time accord commun commiss european parliament council quot simpler legisl intern market quot slim action plan singl market direct repeal replac singl legal instrument interest clariti commun legisl fertilis technic content regul legal instrument impos directli manufactur precis requir appli time manner commun member state fertilis displai technic characterist laid mandatori provis provis composit definit type fertilis design type identif packag differ member state dispar hinder trade commun harmonis object propos action ensur intern market fertilis suffici achiev member state common technic criteria reason scale action achiev commun level commun adopt measur accord principl subsidiar set articl treati accord principl proportion set articl regul order achiev object determin commun level design definit composit fertilis ec fertilis commun rule identif traceabl label ec fertilis closur packag laid procedur establish commun level case member state deem restrict place market ec fertilis product fertilis subject vari degre fluctuat due manufactur techniqu basic materi sampl analyt procedur variat authoris toler declar nutrient content interest agricultur user advis toler narrow limit offici control complianc ec fertilis requir regul qualiti composit carri laboratori approv member state notifi commiss ammonium nitrat essenti ingredi varieti product intend fertilis explos regard natur ammonium nitrat fertilis high nitrogen content consequ requir public safeti health protect worker lai addit commun rule ec fertilis type product hazard instanc purpos intend endang secur person properti manufactur oblig step avoid ensur traceabl fertilis interest public safeti import determin commun level characterist properti distinguish ammonium nitrat ec fertilis high nitrogen content varieti ammonium nitrat manufactur product explos ammonium nitrat ec fertilis high nitrogen content conform characterist ensur harmless manufactur ensur high nitrogen content ammonium nitrat fertilis pass test resist deton fertilis market establish rule method close thermal cycl method necessarili simul condit aris transport storag fertilis contamin substanc potenti pose risk human anim health environ opinion scientif committe toxic ecotox environ sctee commiss intend address issu unintent cadmium content miner fertilis draw propos regul intend present european parliament council similar review undertaken contamin establish procedur observ manufactur repres wish includ type fertilis annex order mark quot ec fertilis quot measur implement regul adopt accord council decis ec june lai procedur exercis implement power confer commiss member state lai penalti respect infring provis regul provid manufactur infring articl fine amount equival ten time market shipment fail compli direct eec eec eec eec repeal adopt regul titl gener provis chapter scope definit articl scope regul appli product market fertilis design quot ec fertilis quot articl definit purpos regul definit appli quot fertilis quot mean materi main function provid nutrient plant quot primari nutrient quot mean element nitrogen phosphoru potassium quot secondari nutrient quot mean element calcium magnesium sodium sulphur quot micro nutrient quot mean element boron cobalt copper iron manganes molybdenum zinc essenti plant growth quantiti small compar primari secondari nutrient quot inorgan fertilis quot mean fertilis declar nutrient form miner obtain extract physic chemic industri process calcium cyanamid urea condens associ product fertilis chelat complex micro nutrient convent class inorgan fertilis quot chelat micro nutrient quot mean micro nutrient held organ molecul list section annex quot complex micro nutrient quot mean micro nutrient held molecul list section annex quot type fertilis quot mean fertilis common type design annex quot straight fertilis quot mean nitrogen phosphat potass fertilis declar content primari nutrient quot compound fertilis quot mean fertilis declar content primari nutrient obtain chemic blend combin quot complex fertilis quot mean compound fertilis obtain chemic reaction solut solid state granul declar content primari nutrient solid state granul nutrient declar composit quot blend fertilis quot mean fertilis obtain dry mix fertilis chemic reaction quot foliar fertilis quot mean fertilis suitabl applic nutrient uptak foliag crop quot fluid fertilis quot mean fertilis suspens solut quot solut fertilis quot mean fluid fertilis free solid particl quot suspens fertilis quot mean phase fertilis solid particl maintain suspens liquid phase quot declar quot mean statement amount nutrient includ form solubl guarante toler quot declar content quot mean content element oxid accord commun legisl label ec fertilis relev accompani document quot toler quot mean permit deviat measur nutrient content declar quot european standard quot mean cen european committe standardis standard offici recognis commun refer publish offici journal european commun quot packag quot mean sealabl receptacl hold protect handl distribut fertilis hold kg quot bulk quot mean fertilis packag prescrib regul quot place market quot mean suppli fertilis return payment free charg storag purpos suppli import fertilis custom territori european commun deem constitut place market quot manufactur quot mean natur legal person respons place fertilis market produc import packag work account person chang characterist fertilis deem manufactur distributor chang characterist fertilis deem manufactur chapter ii place market articl ec fertilis fertilis belong type fertilis list annex compli condit laid regul design quot ec fertilis quot design quot ec fertilis quot fertilis compli regul articl establish commun manufactur establish commun respons conform quot ec fertilis quot provis regul articl free circul prejudic articl commun legisl member state ground composit identif label packag provis contain regul prohibit restrict hinder place market fertilis mark quot ec fertilis quot compli provis regul fertilis mark quot ec fertilis quot accord regul circul freeli commun articl compulsori statement order satisfi requir articl member state prescrib indic nitrogen phosphoru potassium content fertilis market express nitrogen sole element form phosphoru potassium sole element form phosphoru potassium sole oxid form phosphoru potassium element oxid form simultan option chosen prescrib phosphoru potassium content express form element refer annex oxid form read element form numer valu convert factor phosphoru phosphoru pentoxid potassium potassium oxid member state prescrib calcium magnesium sodium sulphur content secondari nutrient fertilis condit articl fulfil primari nutrient fertilis market express oxid form cao mgo na element form ca mg na form convert calcium oxid magnesium oxid sodium oxid sulphur trioxid content calcium magnesium sodium sulphur content factor calcium ca calcium oxid cao magnesium mg magnesium oxid mgo sodium na sodium oxid na sulphur sulphur trioxid calcul oxid element content figur declar round nearest decim place member state prevent place market quot ec fertilis quot label form mention paragraph content micro nutrient boron cobalt copper iron manganes molybdenum zinc ec fertilis belong type fertilis list section annex declar condit fulfil micro nutrient ad minimum quantiti section annex ec fertilis continu satisfi requir section annex micro nutrient normal ingredi raw materi intend suppli primari secondari ca mg na nutrient declar provid micro nutrient present minimum quantiti section annex micro nutrient content declar manner fertilis belong type fertilis list section annex accord requir set column section mixtur fertilis refer micro nutrient meet requir section annex fertilis belong type fertilis list section annex indic total content express percentag fertilis mass ii water solubl content express percentag fertilis mass solubl content half total content micro nutrient total water solubl water solubl content declar micro nutrient chemic link organ molecul content micro nutrient present fertilis declar immedi water solubl content percentag mass product term quot chelat quot quot complex quot organ molecul set section annex organ molecul replac initi articl identif manufactur provid ec fertilis identif mark list articl fertilis pack identif mark packag label attach fertilis bulk mark accompani document articl traceabl prejudic articl manufactur ensur traceabl ec fertilis maintain record origin fertilis record inspect member state long fertilis suppli market period year manufactur stop suppli articl mark prejudic commun rule packag label accompani document refer articl bear mark compulsori identif word quot ec fertilis quot capit letter exist design type fertilis set annex blend fertilis mark quot blend quot design type addit mark articl nutrient word chemic symbol nitrogen phosphoru phosphoru pentoxid potassium potassium oxid calcium ca calcium oxid cao magnesium mg magnesium oxid mgo sodium na sodium oxid na sulphur sulphur trioxid boron copper cu cobalt iron fe manganes mn molybdenum mo zinc zn fertilis micro nutrient part chemic link organ molecul micro nutrient qualifi quot chelat quot chelat agent abbrevi set section annex ii quot complex quot complex agent set section annex micro nutrient contain fertilis list alphabet order chemic symbol cu fe mn mo zn product list section annex specif direct quantiti fluid fertilis express mass express quantiti fluid fertilis volum term mass versu volum kilogram hectolitr gram litr option net gross mass option volum fluid fertilis gross mass tare mass trade address manufactur option identif list annex direct storag handl fertilis list annex section specif direct fertilis indic dose rate condit suitabl soil crop condit fertilis mark manufactur trade descript product indic refer conflict refer separ mark refer paragraph separ inform packag label accompani document fluid fertilis market manufactur suitabl addit instruct cover storag temperatur prevent accid storag detail rule applic articl adopt procedur refer articl articl label label mark print packag give particular mention articl conspicu posit label attach packag system close system consist seal seal bear mark packag mark refer paragraph remain indel legibl case fertilis bulk refer sentenc articl copi document identif mark accompani good access inspect purpos articl languag label mark packag accompani document nation languag languag member state ec fertilis market articl packag case packag ec fertilis packag close devic open fasten fasten seal packag irrepar damag valv sack articl toler nutrient content ec fertilis compli toler establish annex ii intend deviat manufactur sampl analysi manufactur systemat advantag toler annex ii toler allow respect minimum maximum content annex articl fertilis requir type fertilis includ annex nutrient effect manner relev sampl analysi requir test method provid normal condit advers affect human anim plant health environ articl safeguard claus member state justifi ground believ specif ec fertilis satisfi requir regul constitut risk safeti health human anim plant risk environ temporarili prohibit place market fertilis territori make subject special condit immedi inform member state commiss thereof give reason decis commiss adopt decis matter dai receipt inform accord procedur refer articl provis regul preclud take measur commiss member state justifi ground public secur prohibit restrict hinder place market ec fertilis titl ii provis specif type fertilis chapter inorgan primari nutrient fertilis articl scope chapter appli inorgan primari nutrient fertilis solid fluid straight compound includ secondari nutrient micro nutrient minimum nutrient content establish section annex articl declar secondari nutrient primari nutrient fertilis calcium magnesium sodium sulphur content declar secondari nutrient content ec fertilis belong type fertilis list section annex provid element present minimum quantiti calcium oxid cao ca magnesium oxid mgo mg sodium oxid na na sulphur trioxid case addit mark articl ii ad type design articl calcium magnesium sodium sulphur declar magnesium sodium sulphur content fertilis list section annex express wai total content express percentag fertilis mass total content content solubl water express percentag fertilis mass solubl content quarter total content element total solubl water content solubl water declar percentag mass state annex declar calcium content made solubl water express percentag fertilis mass articl identif addit compulsori identif mark refer articl mark set paragraph articl state state type design compound fertilis chemic symbol declar secondari nutrient bracket symbol primari nutrient ii number indic primari nutrient content declar secondari nutrient content bracket primari nutrient content fertilis type design figur indic primari secondari nutrient content micro nutrient declar word quot micro nutrient quot word quot quot name chemic symbol micro nutrient present declar content primari nutrient secondari nutrient percentag mass number method analysi exist decim place fertilis declar nutrient order primari nutrient secondari nutrient cao ca mgo mg na na declar content micro nutrient give symbol micro nutrient indic percentag mass section annex solubl form solubl nutrient express percentag mass fertilis annex explicitli content express number decim place micro nutrient section annex chapter ii inorgan secondari nutrient fertilis articl scope chapter appli inorgan secondari nutrient fertilis solid fluid includ micro nutrient minimum nutrient content establish section annex articl identif addit compulsori identif mark refer articl mark set paragraph articl state micro nutrient declar word quot micro nutrient quot word quot quot name chemic symbol micro nutrient present declar content secondari nutrient percentag mass number method analysi exist decim place secondari nutrient present order cao ca mgo mg na na declar content micro nutrient give symbol micro nutrient indic percentag mass section annex solubl form solubl nutrient express percentag mass fertilis annex explicitli content express number decim place micro nutrient section annex state annex declar calcium content made solubl water express percentag fertilis mass chapter iii inorgan micro nutrient fertilis articl scope chapter appli inorgan micro nutrient fertilis solid fluid minimum nutrient content establish section annex articl identif addit compulsori identif mark refer articl mark set paragraph articl state fertilis micro nutrient type design quot mixtur micro nutrient quot name micro nutrient present chemic symbol fertilis micro nutrient section annex declar micro nutrient content percentag mass number decim place form solubl micro nutrient express percentag mass fertilis annex explicitli content express number decim place micro nutrient section annex compulsori option declar enter label accompani document regard product appear section annex quot recognis exce dose rate quot articl packag ec fertilis cover provis chapter packag chapter iv ammonium nitrat fertilis high nitrogen content articl scope purpos chapter ammonium nitrat fertilis high nitrogen content straight compound ammonium nitrat base product manufactur fertilis mass nitrogen relat ammonium nitrat type fertilis inorgan inert substanc substanc manufactur type fertilis increas sensit heat tendenc deton articl safeti measur control manufactur ensur straight ammonium nitrat fertilis high nitrogen content compli provis section annex iii check analysi test offici control straight ammonium nitrat fertilis high nitrogen content provid chapter carri accord method section annex iii ensur traceabl ammonium nitrat ec fertilis high nitrogen content market manufactur maintain record name address site oper site fertilis princip compon produc record inspect member state long fertilis suppli market period year manufactur stop suppli articl test resist deton prejudic measur refer articl manufactur ensur type ec high nitrogen content ammonium nitrat fertilis market pass test resist deton section method point annex iii regul test carri approv laboratori refer articl manufactur submit result test compet author member state concern dai place fertilis market dai arriv fertilis border european commun case import manufactur continu guarante suppli fertilis market capabl pass abovement test articl packag ammonium nitrat fertilis high nitrogen content made final user packag form titl iii conform assess fertilis articl control measur member state subject fertilis mark quot ec fertilis quot offici control measur purpos verifi compli regul member state charg fee exceed cost test need control measur oblig manufactur repeat test pai repeat test test made laboratori fulfil condit articl test show complianc fertilis question member state ensur sampl analysi offici control ec fertilis belong type fertilis list annex carri accord method annex iii iv complianc regul respect conform type fertilis complianc declar nutrient content declar content express form solubl nutrient verifi offici inspect mean sampl analysi method establish accord annex iii iv take account toler annex ii adapt modernis measur sampl analysi method follow procedur refer articl european standard procedur appli adopt implement rule need control measur provid articl articl regul rule address question frequenc test repeat measur design ensur fertilis put market ident fertilis test articl laboratori member state notifi commiss list approv laboratori territori compet provid servic check complianc ec fertilis requir regul laboratori meet standard mention section annex notif made june occas subsequ modif commiss publish list approv laboratori offici journal european union member state justifi ground believ approv laboratori meet standard refer paragraph rais matter committe refer articl committe agre laboratori meet standard commiss remov list refer paragraph commiss adopt decis matter dai receipt inform accord procedur refer articl commiss publish amend list offici journal european union titl iv final provis chapter adapt annex articl ec fertilis inclus type fertilis annex regul adopt accord procedur refer articl manufactur repres wish propos type fertilis inclus annex requir compil technic file purpos take account technic document refer section annex amend requir adapt annex technic progress adopt accord procedur refer articl articl committe procedur commiss assist committe refer made paragraph articl decis ec appli regard provis articl thereof period laid articl decis ec set month committe adopt rule procedur chapter ii transit provis articl compet laboratori prejudic provis articl member state transit period decemb continu appli nation provis authoris compet laboratori provid servic check complianc ec fertilis requir regul member state notifi list laboratori commiss give detail authoris scheme notif made june occas subsequ modif articl packag label notwithstand articl ec fertilis mark packag label accompani document provid earlier direct continu june chapter iii final provis articl repeal direct direct eec eec eec eec repeal refer direct repeal constru refer regul derog articl direct eec grant commiss articl treati constru derog articl present regul continu produc effect notwithstand entri forc regul pend adopt penalti articl member state continu appli penalti infring nation rule implement direct mention paragraph articl penalti member state lai rule penalti applic infring provis regul measur ensur implement penalti provid effect proportion dissuas articl nation provis member state notifi commiss june nation provis adopt pursuant articl regul notifi delai subsequ amend affect articl entri forc regul enter forc twentieth dai public offici journal european union except articl enter forc june regul bind entireti directli applic member state luxembourg octob european parliament presid cox council presid alemanno oj oj oj opinion european parliament april oj council common posit april oj decis european parliament septemb publish offici journal oj direct amend direct ec european parliament council oj oj direct amend direct ec european parliament council oj oj direct amend direct eec oj oj direct amend direct ec oj oj tabl content gt tabl gt annex list type ec fertilis inorgan straight primari nutrient fertilis nitrogen fertilis gt tabl gt phosphat fertilis particl size criterion prescrib basic constitu materi fertilis sold granular form fertilis establish analyt method gt tabl gt potass fertilis gt tabl gt inorgan compound primari nutrient fertilis npk fertilis gt tabl gt gt tabl gt gt tabl gt gt tabl gt np fertilis gt tabl gt gt tabl gt gt tabl gt gt tabl gt nk fertilis gt tabl gt gt tabl gt gt tabl gt gt tabl gt pk fertilis gt tabl gt gt tabl gt inorgan fluid fertilis straight fluid fertilis gt tabl gt compound fluid fertilis gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt gt tabl gt inorgan secondari nutrient fertilis gt tabl gt inorgan micro nutrient fertilis explanatori note note applic part note chelat agent design mean initi set note product leav solid residu dissolv water quot dissolut quot note micro nutrient present chelat form ph rang guarante accept stabil chelat fraction state fertilis micro nutrient boron gt tabl gt cobalt gt tabl gt copper gt tabl gt iron gt tabl gt manganes gt tabl gt molybdenum gt tabl gt zinc gt tabl gt minimum micro nutrient content percentag weight fertilis solid fluid mixtur micro nutrient gt tabl gt minimum total micro nutrient solid mixtur mass fertilis minimum total micro nutrient fluid mixtur mass fertilis ec fertilis primari secondari nutrient micro nutrient appli soil gt tabl gt ec fertilis primari secondari nutrient micro nutrient leaf sprai gt tabl gt list authoris organ chelat complex agent micro nutrient product authoris provid compli requir direct eec amend chelat agent sodium potassium ammonium acid salt gt tabl gt complex agent list drawn oj chelat agent identifi quantifi european standard en part part extent standard cover agent annex ii toler toler annex neg valu percentag mass toler allow respect declar nutrient content type ec fertilis inorgan straight primari nutrient fertilis absolut percentag mass express mgo cl nitrogen fertilis gt tabl gt phosphat fertilis gt tabl gt phosphat fertilis gt tabl gt potass fertilis gt tabl gt compon gt tabl gt inorgan compound primari nutrient fertilis nutrient element gt tabl gt total neg deviat declar gt tabl gt secondari nutrient fertilis toler allow respect declar calcium magnesium sodium sulphur content quarter declar content nutrient maximum absolut term cao mgo na ca mg na micro nutrient fertilis toler allow respect declar micro nutrient content absolut term content declar content exceed toler allow respect declar content form nitrogen declar solubl phosphoru pentoxid tenth content nutrient concern maximum mass provid content nutrient remain limit annex toler annex iii technic provis ammonium nitrat fertilis high nitrogen content characterist limit straight ammonium nitrat fertilis high nitrogen content poros oil retent oil retent fertilis undergon thermal cycl temperatur rang conform provis part section annex exce mass combust ingredi percentag mass combust materi measur carbon exce fertilis nitrogen content mass exce fertilis nitrogen content mass ph solut fertilis ml water ph particl size analysi mass fertilis pass mm mesh siev mass pass mm mesh siev chlorin maximum chlorin content set mass heavi metal heavi metal ad deliber trace incident product process exce limit fix committe copper content higher mg kg limit heavi metal descript test resist deton ammonium nitrat fertilis high nitrogen content test carri repres sampl fertilis test resist deton mass sampl thermal cycl time compli provis part section annex fertilis subject test resist deton horizont steel tube condit seamless steel tube tube length mm nomin extern diamet mm nomin wall thick mm booster type mass booster chosen maximis deton pressur appli sampl order determin suscept transmiss deton test temperatur wit lead cylind detect deton mm diamet mm high mm interv support tube horizont test carri test deem conclus test support lead cylind crush method check complianc limit annex iii iii method method applic thermal cycl scope field applic document defin procedur applic thermal cycl prior execut oil retent test straight ammonium nitrat fertilis high nitrogen content test resist deton straight compound ammonium nitrat fertilis high nitrogen content method close thermal cycl section regard simul suffici condit account scope applic titl ii chapter iv method necessarili simul condit aris transport storag thermal cycl refer annex iii field applic procedur thermal cycl prior determin oil retent fertilis principl definit erlenmey flask heat sampl ambient temperatur maintain temperatur period hour phase cool sampl temperatur achiev maintain temperatur hour phase combin success phase form thermal cycl subject thermal cycl test sampl held temperatur determin oil retent apparatu normal laboratori apparatu water bath thermost erlenmey flask individu capac ml procedur put test sampl gram erlenmey flask seal stopper move flask hour bath bath vice versa maintain water bath constant temperatur motion rapid stir ensur water level level sampl protect stopper condens foam rubber cap thermal cycl annex iii field applic procedur thermal cycl prior execut deton test principl definit watertight box heat sampl ambient temperatur maintain temperatur period hour phase cool sampl temperatur achiev maintain temperatur hour phase combin success phase form thermal cycl subject requir number thermal cycl test sampl held temperatur pend execut deton test apparatu water bath thermost temperatur rang minimum heat cool rate water bath thermost temperatur water bath continu stir volum bath larg guarante ampl circul water stainless steel box watertight provid thermocoupl centr width box mm wall thick mm figur height length box chosen suit dimens water bath length mm height mm procedur place quantiti fertilis suffici singl deton box close cover place box water bath heat water measur temperatur centr fertilis hour temperatur centr reach cool water hour temperatur centr reach heat water start cycl case water bath transfer box bath heat cool period figur gt pic file quot en tif quot gt method determin oil retent scope field applic document defin procedur determin oil retent straight ammonium nitrat fertilis high nitrogen content method applic prill granular fertilis oil solubl materi definit oil retent fertilis quantiti oil retain fertilis determin oper condit express percentag mass principl total immers test portion ga oil period drain surplu oil condit measur increas mass test portion reagent ga oil viscos max mpa densiti ml sulphur content amp lt ash amp lt apparatu ordinari laboratori apparatu balanc capabl weigh nearest gram beaker capac ml funnel plastic materi prefer cylindr wall upper end diamet approxim mm test siev apertur mm fit funnel note size funnel siev ensur granul lie oil drain easili filter paper rapid filter grade crepe soft mass absorb tissu laboratori grade procedur individu determin carri quick success separ portion test sampl remov particl smaller mm test siev weigh nearest gram approxim gram sampl beaker add suffici ga oil section cover prill complet stir carefulli ensur surfac prill fulli wet cover beaker watch glass leav stand hour filter entir content beaker funnel test siev portion retain siev remain hour excess oil drain lai sheet filter paper mm top smooth surfac fold edg filter paper upward width mm prevent prill roll place layer absorb tissu centr filter paper pour entir content siev absorb tissu spread prill evenli soft flat brush minut lift side tissu transfer prill filter paper beneath spread evenli brush lai sheet filter paper similarli edg turn upward sampl roll prill filter paper circular movement exert pressur paus circular movement lift opposit edg filter paper return centr prill roll peripheri procedur make complet circular movement clockwis anticlockwis roll prill back centr procedur carri time circular movement edg lift carefulli insert sheet filter paper bottom sheet prill roll sheet lift edg upper sheet cover prill sheet filter paper repeat procedur immedi roll pour prill tare dish reweigh nearest gram determin mass quantiti ga oil retain repeat roll procedur reweigh quantiti ga oil retain portion found greater gram place portion fresh set filter paper repeat roll procedur lift corner accord section time circular movement lift reweigh portion express result method calcul formula oil retent determin express percentag mass siev test portion equat gt refer graphic gt mass gram siev test portion mass gram test portion section result weigh result arithmet individu determin method determin combust ingredi scope field applic document defin procedur determin combust content straight ammonium nitrat fertilis high nitrogen content principl carbon dioxid produc inorgan filler remov advanc acid organ compound oxidis mean chromic acid sulphur acid mixtur carbon dioxid form absorb barium hydroxid solut precipit dissolv solut hydrochlor acid measur back titrat sodium hydroxid solut reagent analyt grade chromium vi trioxid cr sulphur acid volum pour ml water litr beaker carefulli add ml sulphur acid densiti ml silver nitrat mol solut barium hydroxid weigh gram barium hydroxid ba dissolv complet hot water cool transfer litr flask fill mark mix filter pleat filter paper hydrochlor acid mol standard solut sodium hydroxid mol standard solut bromophenol blue solut gram litr water phenolphthalein solut gram litr volum ethanol soda lime particl dimens mm demineralis water freshli boil remov carbon dioxid apparatu standard laboratori equip filter crucibl plate sinter glass capac ml plate diamet mm total height mm poros pore diamet µm ml beaker compress nitrogen suppli apparatu made part assembl mean spheric ground joint figur absorpt tube mm long mm diamet fill soda lime place fibreglass plug ml reaction flask side arm round bottom vigreux fraction column mm long doubl surfac condens mm long drechsel bottl act trap excess acid distil ic bath cool drechsel bottl absorpt vessel mm diamet ga distributor compris mm disc low poros sinter glass suction pump suction regul devic compris shape glass piec insert circuit free arm connect fine capillari tube short rubber tube fit screw clamp caution boil chromic acid solut apparatu reduc pressur hazard oper requir precaut procedur sampl analysi weigh approxim gram ammonium nitrat nearest gram remov carbon place sampl analysi reaction flask add ml prill dissolv minut ambient temperatur assembl apparatu diagram connect end absorpt tube nitrogen sourc return flow devic pressur equival mm mercuri end feed tube enter reaction flask place vigreux fraction column condens cool water suppli posit adjust nitrogen provid moder flow solut bring solut boil point heat minut end time effervesc effervesc continu heat minut solut cool minut nitrogen flow complet assembl apparatu diagram connect condens tube drechsel bottl bottl absorpt vessel nitrogen continu pass solut assembl oper rapidli introduc ml barium hydroxid solut absorpt vessel bubbl stream nitrogen minut solut remain clear absorb happen carbon remov process repeat oxid absorpt withdraw nitrogen feed tube rapidli introduc gram chromium trioxid ml silver nitrat solut side arm reaction flask connect apparatu suction pump adjust nitrogen flow steadi stream ga bubbl pass sinter glass absorb heat reaction flask liquid boil boil half hour adjust suction regul valv control nitrogen flow barium carbon precipit test block sinter glass disc oper satisfactori barium hydroxid solut absorb remain clear repeat test stop heat dismantl apparatu wash distributor insid remov barium hydroxid collect wash absorb place distributor ml beaker subsequ determin rapidli filter vacuum firstli content absorb absorb sinter glass crucibl collect precipit rins absorb water wash crucibl ml water place crucibl ml beaker add ml boil water introduc ml boil water absorb pass nitrogen distributor minut combin water beaker repeat oper ensur distributor rins measur carbon origin organ materi add drop phenolphthalein content beaker solut red colour add hydrochlor acid drop drop pink colour disappear stir solut crucibl check pink colour reappear add drop bromphenol blue titrat hydrochlor acid solut turn yellow add ml hydrochlor acid heat solut boil point continu boil maximum minut check carefulli precipit remain liquid cool back titrat sodium hydroxid solut blank test carri blank test procedur quantiti reagent express result content combust ingredi express carbon percentag mass sampl formula gt refer graphic gt mass gram test portion total volum ml mol hydrochlor acid ad chang colour phenolphthalein volum ml mol sodium hydroxid solut back titrat figur gt pic file quot en tif quot gt method determin ph scope field applic document defin procedur measur ph solut straight ammonium nitrat fertilis high nitrogen content principl measur ph ammonium nitrat solut mean ph meter reagent distil demineralis water free carbon dioxid buffer solut ph dissolv gram potassium dihydrogen orthophosph kh po approxim ml water dissolv gram disodium hydrogen orthophosph na hpo approxim ml water transfer solut loss ml graduat flask make mark mix solut airtight vessel buffer solut ph dissolv gram potassium hydrogen phthalat khc water transfer loss ml graduat flask make mark mix solut airtight vessel commerci ph standard solut apparatu ph meter equip glass calomel electrod equival sensit ph unit procedur calibr ph meter calibr ph meter temperatur buffer solut pass slow stream nitrogen surfac solut maintain test determin pour ml water gram sampl ml beaker remov insolubl filter decant centrifug liquid measur ph clear solut temperatur procedur calibr meter express result express result ph unit nearest unit state temperatur method determin particl size scope field applic document defin procedur test siev straight ammonium nitrat fertilis high nitrogen content principl test sampl siev nest siev hand mechan mean mass retain siev record percentag materi pass requir siev calcul apparatu mm diamet woven wire test siev apertur mm mm mm standard rang lid receiv siev balanc weigh gram mechan siev shaker capabl impart vertic horizont motion test sampl procedur sampl divid repres portion approxim gram weigh portion nearest gram arrang nest siev ascend order receiv mm mm mm place weigh test portion top siev fit lid top nest siev shake hand machin impart vertic horizont motion hand tap occasion continu process minut quantiti pass siev minut gram remov siev nest turn collect materi retain brush gentli revers side soft brush weigh materi retain siev collect receiv nearest gram evalu result convert fraction mass percentag total fraction mass origin charg calcul percentag receiv amp lt mm calcul percentag retain mm siev calcul percentag pass mm sum fraction mass initi mass separ analys carri individu result differ absolut absolut repeat test case express result report valu obtain hand method determin chlorin content chlorid ion scope field applic document defin procedur determin chlorin content chlorid ion straight ammonium nitrat fertilis high nitrogen content principl chlorid ion dissolv water determin potentiometr titrat silver nitrat acid medium reagent distil demineralis water free chlorid ion aceton ar concentr nitric acid densiti ml silver nitrat mol standard solut store solut brown glass bottl silver nitrat mol standard solut prepar solut time potassium chlorid mol standard refer solut weigh nearest mg gram analyt grade potassium chlorid previous dri hour oven cool desicc ambient temperatur dissolv water transfer solut loss ml standard flask dilut mark mix potassium chlorid mol standard refer solut prepar solut time apparatu potentiomet silver indic electrod calomel refer electrod sensit mv cover rang mv bridg satur potassium nitrat solut connect calomel electrod fit end porou plug magnet stirrer teflon coat rod microburett fine point tip graduat ml divis procedur standardis silver nitrat solut ml ml standard refer potassium chlorid solut place low form beaker conveni capac ml carri titrat content beaker add ml nitric acid solut ml aceton suffici water bring total volum ml place rod magnet stirrer beaker set stirrer motion immers silver electrod free end bridg solut connect electrod potentiomet verifi apparatu note start potenti titrat microburett ad initi ml silver nitrat solut standard refer potassium chlorid solut continu addit ml portion mol solut ml portion mol solut addit await stabilis potenti record volum ad valu potenti column tabl column tabl record success increment potenti fourth column record differ posit neg potenti increment end titrat correspond addit ml portion silver nitrat solut maximum order calcul exact volum veq silver nitrat solut end reaction formula gt refer graphic gt total volum ml silver nitrat solut immedi lower volum maximum increment volum ml portion silver nitrat solut ad ml posit sum absolut valu posit valu neg tabl blank test carri blank test account thereof calcul final result result blank test reagent ml formula gt refer graphic gt ml exact volum veq silver nitrat solut titrat ml potassium chlorid standard refer solut ml exact volum veq silver nitrat solut titrat ml potassium chlorid standard refer solut check test blank test time serv check apparatu function satisfactorili test procedur implement correctli determin portion sampl rang gram weigh nearest gram transfer quantit ml beaker add ml water ml nitric acid solut ml aceton suffici water bring total volum ml place rod magnet stirrer beaker place beaker stirrer set stirrer motion immers silver electrod free end bridg solut connect electrod potentiomet verifi apparatu note start potenti titrat silver nitrat solut addit microburett increment ml addit await stabilis potenti continu titrat start fourth paragraph quot record volum ad valu potenti column tabl quot express result express result analysi percentag chlorin contain sampl receiv analysi calcul percentag chlorin cl content formula gt refer graphic gt concentr silver nitrat solut mol result ml blank test ml veq determin mass gram test portion tabl gt tabl gt method determin copper scope field applic document defin procedur determin copper content straight ammonium nitrat fertilis high nitrogen content principl sampl dissolv dilut hydrochlor acid copper determin atom absorpt spectrophotometri reagent hydrochlor acid densiti ml hydrochlor acid mol solut hydrochlor acid mol solut ammonium nitrat hydrogen peroxid copper solut stock weigh nearest gram gram pure copper dissolv ml mol hydrochlor acid solut add ml hydrogen peroxid portion dilut litr water ml solut µg copper cu copper solut dilut dilut ml stock solut ml water dilut ml result solut ml water ml final dilut µg copper cu prepar solut time apparatu atom absorpt spectrophotomet copper lamp nm procedur prepar solut analysi weigh nearest gram gram sampl place ml beaker add carefulli ml hydrochlor acid vigor reaction due carbon dioxid format add hydrochlor acid effervesc stop evapor dryness steam bath stir occasion glass rod add ml mol hydrochlor acid solut ml water stir glass rod left beaker cover beaker watch glass boil solut gentli dissolut complet cool transfer solut quantit ml graduat flask wash beaker ml mol hydrochlor acid ml boil water make mark mol hydrochlor acid mix carefulli filter copper free filter paper discard ml blank solut prepar blank solut sampl omit calcul final result determin prepar sampl blank test solut dilut sampl solut blank test solut mol hydrochlor acid solut concentr copper optim measur rang spectrophotomet dilut need prepar calibr solut dilut standard solut mol hydrochlor acid solut prepar standard solut optim measur rang spectrophotomet mg cu make mark add solut ammonium nitrat give concentr mg ml measur set spectrophotomet wavelength nm oxidis air acetylen flame sprai success triplic calibr solut sampl solut blank solut wash instrument distil water sprai plot calibr curv absorb standard ordin concentr copper µg ml abscissa determin concentr copper final sampl blank solut refer calibr curv express result calcul copper content sampl take account mass test sampl dilut carri analysi blank express result mg cu kg determin resist deton scope field applic document defin procedur determin resist deton ammonium nitrat fertilis high nitrogen content principl test sampl confin steel tube subject deton shock explos booster charg propag deton determin degre crush lead cylind tube rest horizont test materi plastic explos penthrit densiti kg deton veloc mass gram length flexibl deton cord metal sleev fill mass length cord mm compress pellet secondari explos recess receiv deton explos hexogen wax tetryl similar secondari explos ad graphit densiti kg diamet mm height mm central recess receiv deton diamet mm depth mm seamless steel tube iso heavi seri nomin dimens dn diamet mm wall thick mm length mm bottom place materi steel good weldabl qualiti dimens mm thick mm lead cylind diamet mm height mm materi soft lead puriti steel block length mm width mm height mm mass kg firm base steel block plastic cardboard cylind booster charg wall thick mm diamet mm height mm deton electr electr initi forc wooden disc diamet mm diamet match intern diamet plastic cardboard cylind thick mm wooden rod dimens deton dressmak pin maximum length mm procedur prepar booster charg insert steel tube method initi explos booster charg depend avail equip point simultan initi booster charg prepar shown figur drill hole wooden disc parallel axi disc centr point symmetr distribut concentr circl mm diamet diamet hole mm section figur depend diamet deton cord cut length flexibl deton cord mm long avoid loss explos end make clean cut immedi seal end adhes push length hole wooden disc end project centimetr side disc insert small dressmak pin transvers textil sleev length cord mm end appli adhes length cord band cm wide adjac pin final pull long piec cord bring pin contact wooden disc shape plastic explos form cylind mm diamet depend diamet cylind stand cylind upright level surfac insert shape explos insert wooden disc carri length deton cord top cylind press explos adjust height cylind mm top edg extend level wood final fix cylind wooden disc instanc stapl small nail entir circumfer group free end length deton cord circumfer wooden rod end level plane perpendicular rod secur bundl rod mean adhes tape central initi compress pellet booster charg prepar shown figur prepar compress pellet take safeti precaut place gram secondari explos mould insid diamet mm compress correct shape densiti ratio diamet height roughli centr bottom mould peg mm height mm diamet depend diamet deton form cylindr recess compress cartridg subsequ insert deton prepar booster charg place explos cylind stand upright level surfac press wooden die give explos cylindr shape central recess insert compress pellet recess cover cylindr shape explos compress pellet wooden disc central hole mm diamet insert deton fix wooden disc cylind cross adhes tape ensur hole drill disc recess compress pellet coaxial insert wooden rod prepar steel tube deton test end steel tube drill diametr oppos hole mm diamet perpendicularli side wall distanc mm edg butt weld bottom plate opposit end tube complet fill angl bottom place wall tube weld metal entir circumfer tube fill charg steel tube figur test sampl steel tube booster charg condit temperatur kg test sampl need deton test place tube upright squar bottom place rest firm flat surfac prefer concret fill tube height test sampl drop cm vertic floor time compact prill granul dens tube acceler compact vibrat tube strike side wall gram hammer drop total time repeat charg method portion test sampl final addit made compact rais drop tube time total intermitt hammer blow charg fill tube distanc mm orific fill height sampl adjust steel tube booster charg insert close contact sampl entir surfac insert booster charg tube contact sampl top surfac wooden disc mm end tube ensur essenti close contact explos test sampl ad remov small quantiti sampl shown figur split pin insert hole open end tube leg open flat tube posit steel tube lead cylind figur number base lead cylind make mark mm centr line steel block ly horizont base mark mm edg block place lead cylind upright mark base cylind centr mark lai steel tube prepar horizont lead cylind axi tube parallel centr line steel block weld end tube extend mm lead cylind prevent tube roll insert small wooden wedg top lead cylind tube wall side place cross wood tube steel block note make tube contact lead cylind slight curvatur tube surfac compens rotat tube longitudin axi lead cylind tall tap cylind question carefulli hammer requir height prepar deton set apparatu bunker suitabl prepar underground site mine tunnel ensur temperatur steel tube deton note fire site work concret line pit cover wooden beam deton steel fragment project high kinet energi fire carri suitabl distanc dwell thoroughfar booster charg point initi ensur deton cord stretch footnot arrang horizont final remov wooden rod replac deton carri fire danger zone evacu test personnel cover deton explos suffici time fume gaseou toxic decomposit product nitrou gase dispers collect lead cylind measur height vernier calip record mark lead cylind degre crush express percentag origin height mm cylind crush obliqu record highest lowest valu calcul averag probe continu measur deton veloc probe insert longitudin axi tube side wall deton test sampl carri test report valu paramet test report deton test valu measur diamet steel tube wall thick brinel hard steel tube temperatur tube sampl shortli fire pack densiti kg sampl steel tube height lead cylind fire cylind number method initi emploi booster charg evalu test result fire crush lead cylind test consid conclus sampl conform requir annex iii figur gt pic file quot en tif quot gt figur gt pic file quot en tif quot gt figur gt pic file quot en tif quot gt reaction time half hour suffici case organ substanc presenc silver nitrat catalyst commerci standard copper solut whatman equival diamet disc correspond insid diamet cylind nb peripher length cord taut assembl central cord remain slightli slack annex iv method sampl analysi method sampl control fertilis introduct correct sampl difficult oper requir greatest care obtain suffici repres sampl offici test fertilis stress sampl method appli strict accuraci specialist experi convent sampl procedur purpos scope sampl intend offici control fertilis qualiti composit method sampl obtain consid repres sampl portion sampl offic sampl specialist offic authoris purpos member state definit sampl portion quantiti product constitut unit characterist presum uniform increment sampl quantiti point sampl portion aggreg sampl aggreg increment sampl sampl portion reduc sampl repres part aggreg sampl obtain process reduct final sampl repres part reduc sampl apparatu sampl apparatu made materi affect characterist product sampl apparatu offici approv member state apparatu recommend sampl solid fertilis manual sampl flat bottom shovel vertic side sampl spear long split compart dimens sampl spear characterist sampl portion depth contain dimens sack particl size fertilis mechan sampl approv mechan apparatu sampl move fertilis divid apparatu design divid sampl equal part take increment sampl prepar reduc final sampl apparatu recommend sampl fluid fertilis manual sampl open tube probe bottl equip sampl random sampl portion mechan sampl approv mechan apparatu sampl move fluid fertilis quantit requir sampl portion size sampl portion constitu part sampl increment sampl loos solid fertilis fluid fertilis contain exceed kg sampl portion exceed tonn minimum number increment sampl sampl portion exceed tonn tonn minimum number increment sampl gt refer graphic gt sampl portion exceed tonn minimum number increment sampl packag solid fertilis fluid fertilis contain packag exceed kg packag kg sampl portion packag minimum number packag sampl packag sampl portion packag minimum number packag sampl sampl portion packag minimum number packag sampl gt refer graphic gt sampl portion exceed packag minimum number packag sampl packag exceed kg minimum number packag sampl aggreg sampl singl aggreg sampl sampl portion requir total mass increment sampl make aggreg sampl loos solid fertilis fluid fertilis contain exceed kg kg packag solid fertilis fluid fertilis contain packag exceed kg packag kg kg packag exceed kg mass content origin packag ammonium nitrat fertilis sampl test annex iii kg final sampl aggreg sampl final sampl reduct analysi final sampl requir mass sampl analysi solid fluid fertilis ammonium nitrat fertilis sampl test aggreg sampl final sampl test reduct minimum final sampl mass annex iii test kg minimum final sampl mass annex iii test kg instruct take prepar packag sampl gener sampl prepar quickli bear mind precaut ensur remain repres fertilis sampl instrument surfac contain intend receiv sampl clean dry case fluid fertilis sampl portion mix prior sampl increment sampl increment sampl random sampl portion approxim equal size loos solid fertilis fluid fertilis contain exceed kg imaginari divis made sampl portion number approxim equal part number part number increment sampl requir accord select random sampl part compli requir sampl bulk fertilis fluid fertilis contain exceed kg sampl carri sampl portion move load unload case sampl randomli select notion part defin move packag solid fertilis fluid fertilis contain packag exceed kg select requir number packag sampl part content packag remov sampl empti packag separ prepar aggreg sampl increment sampl mix form singl aggreg sampl prepar final sampl materi aggreg sampl carefulli mix aggreg sampl reduc kg reduc sampl mechan divid quarter method final sampl prepar approxim amount conform quantit requir sampl put air tight contain precaut avoid chang characterist sampl test annex iii section final sampl temperatur packag final sampl contain packag scale label total label incorpor seal manner open damag seal sampl record record sampl permit sampl portion identifi unambigu destin sampl sampl portion final sampl quickli authoris analyt laboratori test institut inform analysi test method analysi fertilis tabl content gener observ laboratori equip descript method gener laboratori equip precis defin size flask pipett case laboratori apparatu clean small quantiti element determin control test analysi ensur apparatu function analyt techniqu carri correctli chemic compound composit ammonium sulphat mono potassium phosphat result analys fertilis wrong chemic composit analyt techniqu rigor hand number determin empir rel product complex chemic composit recommend laboratori make standard refer fertilis defin composit gener provis relat method analys fertilis reagent method analysi reagent analysi pur micro nutrient analys puriti reagent check mean blank test depend result obtain conduct purif water dissolut dilut rins wash oper refer method analysi natur solvent diluent water impli water demineralis distil specif instanc mention method analysi water subject specif purif process laboratori equip view equip inspect laboratori apparatu method analysi restrict special instrument apparatu demand specif requir equip perfectli clean small quantiti determin laboratori ensur accuraci graduat glasswar refer metrolog standard method prepar sampl analysi scope document defin procedur prepar sampl analysi final sampl principl prepar final sampl receiv laboratori seri oper siev grind mix carri hand smallest amount weigh laid method analysi repres laboratori sampl hand fine fertilis chang prepar extent solubl extract reagent appreci affect apparatu sampl divid option siev apertu mm ml flask stopper porcelain pestl mortar grinder choic treatment preliminari remark product suitabl repres part final sampl final sampl ground calcium nitrat calcium magnesium nitrat sodium nitrat chile nitrat calcium cyanamid nitrogen calcium cyanamid ammonium sulphat ammonium nitrat urea basic slag natur phosphat render partial solubl precipit dihydr dicalcium phosphat calcin phosphat aluminium calcium phosphat soft ground rock phosphat final sampl divid part ground product respect determin carri previou grind fine grind determin grind includ compound fertilis phosphat ingredi basic slag aluminium calcium phosphat calcin phosphat soft ground rock phosphat natur phosphat render partial solubl end divid final sampl part ident sampl divid quarter final sampl respect determin carri ground product repres part final sampl ground fertilis list found method part final sampl refer siev rapidli siev apertur mm residu ground roughli obtain product minimum fine particl siev grind condit substanc appreci heat oper repeat time residu effect quickli order prevent gain loss constitu water ammonia ground siev product clean flask stopper weigh carri analysi sampl mix special case fertilis compris blend categori crystal case separ frequent occur absolut essenti crush pass sampl siev apertur mm mixtur ammonium phosphat potassium nitrat grind final sampl recommend case product residu difficult grind fertilis substanc weigh residu account mass calcul final result product decompos heat grind carri avoid heat prefer case mortar grind compound fertilis calcium cyanamid urea product abnorm moist made past grind ensur homogen siev chosen smallest apertur compat destruct lump hand pestl case mixtur ingredi water crystallis method nitrogen method determin ammoniac nitrogen scope document defin procedur determin ammoniac nitrogen field applic nitrogen fertilis includ compound fertilis nitrogen found exclus form ammonium salt ammonium salt nitrat applic fertilis urea cyanamid organ nitrogen compound principl displac ammonia mean excess sodium hydroxid distil determin yield ammonia volum standard sulphur acid titrat excess acid mean standard solut sodium potassium hydroxid reagent distil demineralis water free carbon dioxid nitrogen compound dilut hydrochlor acid volum hcl ml volum water gt tabl gt sodium hydroxid approxim naoh ml ammonia free indic solut mix indic solut dissolv methyl red ml sodium hydroxid solut mol make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop indic solut methyl red indic solut dissolv methyl red ml ethanol make ml water filter indic drop preced anti bump granul pumic stone wash hydrochlor acid calcin ammonium sulphat analysi apparatu distil apparatu consist round bottom flask suitabl capac connect condens mean splash head note type equip approv recommend determin reproduc show featur construct figur pipett ml ml graduat flask rotari shaker turn minut prepar sampl method method analysi prepar solut carri solubl test sampl water room temperatur proport weigh indic tabl quantiti prepar sampl place ml graduat flask result solubl test proce product complet solubl water add flask quantiti water need dissolv sampl shake complet dissolv make volum mix product complet solubl water add flask ml water ml hydrochlor acid shake leav undisturb evolut carbon dioxid ceas add ml water shake half hour rotari shaker make volum water mix filter dry filter dry receptacl analysi solut variant chosen place receiv flask measur quantiti standard sulphur acid tabl add quantiti chosen indic solut water order obtain volum ml end extens tube condens surfac solut transfer precis pipett detail tabl aliquot portion clear solut distil flask apparatu add water order obtain total volum ml grain pumic order control boil assembl distil apparatu take care avoid loss ammonia add content distil flask ml concentr sodium hydroxid solut ml reagent case ml hydrochlor acid order dissolv test sampl gradual warm flask avoid boil vigor boil commenc distil rate ml minut total volum distil ml ammonia evolv lower receiv flask tip condens extens surfac liquid test subsequ distil mean reagent ensur ammonia complet distil wash condens extens water titrat surplu acid standard solut sodium potassium hydroxid prescrib variant adopt note note standard solut strength back titrat provid volum titrat exce ml blank make blank test condit refer calcul final result control test carri analys check apparatu work properli correct applic method aliquot part freshli prepar solut ammonium sulphat maximum quantiti nitrogen prescrib chosen variant express result express result analysi percentag ammoniac nitrogen fertilis receiv analysi annex note quot apparatu quot figur refer construct featur type equip document tabl determin ammoniac nitrogen ammoniac nitrat nitrogen fertilis tabl weigh dilut calcul carri variant method variant gt tabl gt variant gt tabl gt variant gt tabl gt figur gt pic file quot en tif quot gt figur gt pic file quot en tif quot gt figur gt pic file quot en tif quot gt figur gt pic file quot en tif quot gt kei figur figur round bottom long neck flask ml capac distil tube splash head connect condens mean spheric joint spheric joint connect condens replac rubber connect funnel teflon tap addit sodium hydroxid tap likewis replac rubber connect clip bulb condens spheric joint entranc join issu glass extens tube mean small rubber connect connect distil tube effect mean rubber tube spheric joint replac suitabl rubber bung ml flask distil collect equip made borosil glass figur round bottom short neck flask ml capac spheric joint distil tube splash head equip spheric joint entranc spheric joint issu connect side funnel teflon tap addit sodium hydroxid bulb condens spheric joint entranc join issu glass extens tube mean small rubber connect ml flask distil collect equip made borosil glass figur round bottom long neck flask ml capac bell mouth distil tube splash head spheric joint issu elbow tube spheric joint entranc drip cone connect distil tube effect mean rubber tube spheric joint bulb condens join issu glass extens tube mean small rubber connect ml flask distil collect equip made borosil glass figur round bottom long neck flask ml capac bell mouth distil tube splash head spheric joint issu connect side funnel teflon tap addit sodium hydroxid suitabl rubber bung spheric joint tap replac rubber connect clip bulb condens spheric joint entranc join issu rubber connect glass extens tube connect distil tube effect mean rubber tube spheric joint replac suitabl rubber bung ml flask collect distil equip made borosil glass method determin nitric ammoniac nitrogen method determin nitric ammoniac nitrogen ulsch scope document defin procedur determin nitrat ammoniac nitrogen reduct ulsch field applic nitrogen fertilis includ compound fertilis nitrogen found exclus nitrat form ammoniac nitrat form principl reduct nitrat nitrit ammonia mean metal iron acid medium displac ammonia form addit excess sodium hydroxid distil ammonia determin yield ammonia volum standard sulphur acid solut titrat excess sulphur acid mean standard solut sodium potassium hydroxid reagent distil demineralis water free carbon dioxid nitrogen compound dilut hydrochlor acid volum hcl ml volum water sulphur acid mol sodium potassium hydroxid solut carbon free mol sulphur acid solut approxim ammonia free powder iron reduc hydrogen prescrib quantiti iron reduc nitrat nitrogen sodium hydroxid solut approxim naoh ml ammonia free indic solut mix indic solut dissolv methyl red ml mol sodium hydroxid solut make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop methyl red indic solut dissolv methyl red ml ethanol make ml water filter indic drop preced anti bump granul pumic stone wash hydrochlor acid calcin sodium nitrat analysi apparatu method quot determin ammoniac nitrogen quot prepar sampl method quot prepar sampl quot method analysi prepar solut method quot determin ammoniac nitrogen quot procedur place receiv flask measur quantiti ml standard sulphur acid tabl method variant add quantiti indic solut end extens tube condens surfac standard acid receiv flask precis pipett transfer aliquot part clear solut tabl method variant place distil flask apparatu add ml water ml sulphur acid solut stir add reduc iron wash neck flask millilitr water place neck flask small long stem funnel heat boil water bath hour wash stem funnel millilitr water take care avoid loss ammonia add content distil flask ml concentr sodium hydroxid solut case ml hydrochlor acid dissolv sampl add ml concentr sodium hydroxid solut assembl distil apparatu distil ammonia procedur method blank test carri blank test omit sampl condit refer calcul final result control test analysi check apparatu work properli correct applic method aliquot part freshli prepar solut sodium nitrat nitrogen express result express result analysi percentag nitrat nitrogen combin ammoniac nitrat nitrogen contain fertilis receiv analysi method determin nitric ammoniac nitrogen arnd scope document defin procedur determin nitric ammoniac nitrogen reduct arnd modifi variant field applic method principl reduct nitrat nitrit ammonia neutral aqueou solut mean metal alloi compos cu mg arnd alloi presenc magnesium chlorid mgcl distil ammonia determin yield volum standard sulphur acid solut titrat excess acid mean standard solut sodium potassium hydroxid reagent distil demineralis water free carbon dioxid nitrogen compound dilut hydrochlor acid volum hcl volum water gt tabl gt sodium hydroxid solut approxim mol arnd alloi analysi powder pass siev apertur mm squar magnesium chlorid solut dissolv magnesium chlorid mgcl approxim ml water litr flat bottom flask prevent froth add magnesium sulphat mgso dissolut add magnesium oxid anti bump granul pumic stone concentr suspens ml boil expel trace ammonia reagent cool make volum litr filter indic solut mix indic solut dissolv methyl red ml mol sodium hydroxid solut make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop methyl red indic solut dissolv methyl red ml ethanol make ml water filter indic drop preced congo red indic solut dissolv congo red litr warm water filter cool indic neutralis acid extract distil ml ml liquid neutralis anti bump granul pumic stone wash hydrochlor acid calcin sodium nitrat analysi apparatu method quot determin ammoniac nitrogen quot prepar sampl method method analysi prepar solut analysi method quot determin ammoniac nitrogen quot analysi solut chosen variant place receiv flask measur quantiti standard sulphur acid tabl method add quantiti chosen indic solut final suffici water give volum ml end extens tube condens surfac solut precis pipett tabl adequ aliquot clear solut place distil flask add suffici water obtain total volum ml note arnd alloi ml magnesium chlorid solut fragment pumic stone rapidli connect flask distil apparatu heat gentli minut increas heat distil ammonia continu distil hour time residu flask syrupi consist distil finish titrat quantiti excess acid receiv task procedur method note sampl solut acid addit ml hcl dissolv sampl aliquot part analysi neutralis distil flask aliquot part add ml water quantiti indic shake carefulli neutralis mol sodium hydroxid solut acidifi drop hydrochlor acid proce line blank test carri blank test omit sampl condit refer calcul final result control test analysi check apparatu work properli correct techniqu appli freshli prepar solut sodium nitrat nitrat nitrogen depend variant chosen express result method method determin nitric ammoniac nitrogen devarda scope document defin procedur determin nitrat ammoniac nitrogen reduct devarda modifi variant field applic method principl reduct nitrat nitrit ammonia strongli alkalin solut mean metal alloi compos al zn cu devarda alloi distil ammonia determin yield volum standard sulphur acid titrat excess sulphur acid mean standard solut sodium potassium hydroxid reagent distil demineralis water free carbon dioxid nitrogen compound dilut hydrochlor acid volum hcl volum water gt tabl gt devarda alloi analysi powder pass siev apertur mm squar pass siev apertur mm squar pre pack bottl maximum recommend sodium hydroxid solut approxim naoh ml ammonia free indic solut mix indic solut dissolv methyl red ml mol sodium hydroxid solut make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop methyl red indic dissolv methyl red ml ethanol make ml water filter indic drop preced ethanol sodium nitrat analysi apparatu method distil apparatu consist round bottom flask suitabl capac connect condens distil tube splash head equip addit bubbl trap receiv flask prevent loss ammonia type apparatu approv determin reproduc show featur construct figur pipett ml ml graduat flask rotari shaker turn minut prepar sampl method procedur prepar solut analysi method quot determin ammoniac nitrogen quot analysi solut quantiti nitric nitrogen present aliquot part solut exce maximum quantiti express tabl variant chosen place receiv flask measur quantiti standard sulphur acid tabl add quantiti chosen indic solut final suffici water give volum ml end extens tube condens underneath surfac solut fill bubbl trap distil water precis pipett aliquot part tabl method place distil flask add suffici water distil flask obtain volum ml ml ethanol devarda alloi note take precaut avoid loss ammonia add flask ml sodium hydroxid solut final case acid solubl sampl addit quantiti suffici neutralis quantiti hydrochlor acid present aliquot part analysi connect distil flask apparatu ensur tight connect carefulli shake flask mix content warm gentli releas hydrogen decreas appreci half hour liquid boil continu distil increas heat ml liquid distil minut prolong distil minut distil complet disconnect receiv flask apparatu carefulli wash extens tube bubbl trap collect rins titrat flask titrat excess acid procedur method note presenc calcium salt calcium nitrat calcium ammonium nitrat add distil gram sampl present aliquot sodium phosphat na hpo prevent format ca blank test carri blank test omit sampl condit refer calcul final result control test carri analysi check apparatu work properli correct applic method aliquot freshli prepar solut sodium nitrat variant chosen nitrat nitrogen express result method figur gt pic file quot en tif quot gt kei figur ml ml round bottom long neck flask bell mouth distil tube splash head spheric joint issu elbow tube spheric joint entranc drip cone issu suitabl rubber connect spheric joint bulb condens extens tube mount rubber bung hold bubbl trap ml receiv flask bubbl trap prevent loss ammonia equip made borosil glass method determin total nitrogen method determin total nitrogen calcium cyanamid nitrat free scope document defin procedur determin total nitrogen nitrat free calcium cyanamid field applic exclus calcium cyanamid nitrat free principl kjeldahl digest ammoniac nitrogen form displac sodium hydroxid collect estim standard solut sulphur acid reagent distil demineralis water free carbon dioxid nitrogen compound dilut sulphur acid ml volum sulphur acid ml volum water potassium sulphat analysi copper oxid cuo estim equival quantiti copper sulphat pentahydr cuso estim sodium hydroxid solut approxim naoh ml ammonia free gt tabl gt indic solut mix indic solut dissolv methyl red ml mol sodium hydroxid solut make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop methyl red indic dissolv methyl red ml ethanol make ml water filter indic drop preced anti bump granul pumic stone wash hydrochlor acid calcin potassium thiocyan analysi apparatu distil apparatu method quot determin ammoniac nitrogen quot long neck kjeldahl flask suitabl capac pipett ml ml graduat flask prepar sampl method procedur prepar solut analysi weigh nearest sampl place kjeldahl flask add ml dilut sulphur acid potassium sulphat prescrib catalyst heat slowli drive water boil gentli hour cool dilut ml water cool transfer quantit suspens graduat ml flask make volum water shake filter dry filter dry flask analysi solut pipett transfer variant chosen method ml solut obtain distil ammonia method ad suffici naoh solut ensur consider excess blank test carri blank test omit sampl condit refer calcul final result control test carri analysi check apparatu work properli correct applic method aliquot part standard solut potassium thiocyan approxim concentr nitrogen sampl express result express result percentag nitrogen contain fertilis receiv analysi variant variant variant method determin total nitrogen calcium cyanamid nitrat scope document defin procedur determin total nitrogen calcium cyanamid field applic method applic calcium cyanamid nitrat principl direct applic kjeldahl method appli calcium cyanamid nitrat reason nitrat nitrogen reduc ammonia metal iron stannou chlorid kjeldahl digest reagent distil demineralis water free carbon dioxid nitrogen compound sulphur acid ml powder iron reduc hydrogen potassium sulphat fine pulveris analysi gt tabl gt indic solut mix indic solut dissolv methyl red ml mol sodium hydroxid solut make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop indic solut methyl red indic dissolv methyl red ml ethanol make ml water filter indic drop preced solut stannou chlorid dissolv sncl ml concentr hydrochlorin acid ml make litr water solut complet clear prepar immedi essenti check reduc power stannou chlorid note dissolv sncl ml concentr hydrochlor acid ml make ml water add rochel salt potassium sodium tartrat suffici quantiti sodium bicarbon analysi solut show alkalin reaction litmu paper test titrat mol iodin solut presenc starch solut indic ml iodin solut mol correspond sncl total tin present solut prepar bival form titrat ml mol iodin solut solut sodium hydroxid naoh ml ammonia free standard nitrat ammoniac solut weigh potassium nitrat analysi ammonium sulphat analysi place ml graduat flask dissolv water make ml ml solut nitrogen pumic stone anti bump granul wash hydrochlor acid calcin apparatu method prepar sampl method procedur prepar solut weigh nearest sampl place kjeldahl flask add powder iron ml stannou chlorid solut stir leav stand half hour time left stand stir minut add potassium sulphat ml sulphur acid boil carri process hour appear white fume leav cool dilut ml water transfer suspens quantit ml graduat flask cool make volum water stir filter dry filter dry contain siphon suspens order appli variant method ammoniac nitrogen solut distil directli ad suffici sodium hydroxid ensur larg surplu analysi solut pipett transfer variant method ml solut obtain distil ammonia process method take care add distil flask suffici sodium hydroxid solut ensur larg excess blank test carri blank test omit sampl condit refer calcul final result control test carri analysi check apparatu work properli correct applic method standard solut quantiti ammoniac nitrat nitrogen compar quantiti cyanamid nitrat nitrogen contain nitrat calcium cyanamid purpos place ml standard solut kjeldahl flask carri analysi method express result result analysi express percentag total nitrogen contain fertilis receiv analysi variant variant variant method determin total nitrogen urea scope document defin procedur determin total nitrogen urea field applic method appli exclus urea fertilis nitrat free principl urea transform quantit ammonia boil presenc sulphur acid ammonia obtain distil alkalin medium distil collect excess standard sulphur acid excess acid titrat mean standard alkalin solut reagent distil demineralis water free carbon dioxid nitrogen compound sulphur acid concentr ml sodium hydroxid solut approxim naoh ml ammonia free gt tabl gt indic solut mix indic solut dissolv methyl red ml mol sodium hydroxid solut make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop methyl red indic solut dissolv methyl red ml ethanol make ml water filter indic drop preced anti bump granul pumic stone wash hydrochlor acid calcin urea analysi apparatu distil apparatu method quot determin ammoniac nitrogen quot ml graduat flask pipett ml prepar sampl method procedur prepar solut weigh nearest prepar sampl place ml kjeldahl flask moisten ml water stir ml concentr sulphur acid add glass bead prevent bump prevent splash place long stem glass funnel neck flask heat slowli increas heat white fume observ minut cool dilut ml water quantit transfer ml volumetr flask discard sediment cool room temperatur make volum water mix filter dry filter dry receptacl analysi solut precis pipett transfer ml solut obtain distil flask variant chosen method distil ammonia method ad suffici naoh ml distil flask ensur consider excess blank test carri blank test omit sampl condit refer calcul final result control test carri analysi check apparatu work properli correct applic method aliquot part freshli prepar solut urea express result express result percentag nitrogen contain fertilis receiv analysi variant variant variant method determin cyanamid nitrogen scope document defin procedur determin cyanamid nitrogen field applic calcium cyanamid calcium cyanamid nitrat mixtur principl cyanamid nitrogen precipit silver complex estim precipit kjeldahl method reagent distil demineralis water free carbon dioxid nitrogen compound glacial acet acid ammonia solut ammonia ga mass ml ammoniac silver solut tollen mix ml silver nitrat agno solut water ml ammonia expos unnecessarili light heat air solut year long solut remain clear reagent good qualiti concentr sulphur acid ml potassium sulphat analysi copper oxid cuo estim equival quantiti copper sulphat pentahydr cuso estim sodium hydroxid solut approxim naoh ml ammonia free sulphur acid mol sodium potassium hydroxid solut mol indic solut mix indic solut dissolv methyl red ml mol sodium hydroxid solut make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop methyl red indic solut dissolv methyl red ml ethanol make ml water filter indic drop preced anti bump granul pumic stone wash hydrochlor acid calcin potassium thiocyan analysi apparatu distil apparatu method quot determin ammoniac nitrogen quot ml graduat flask stohmann long neck kjeldahl flask suitabl capac ml ml pipett rotari shaker turn minut prepar method procedur safeti precaut ammoniac silver solut safeti goggl worn thin membran form surfac liquid explos produc agit greatest caution essenti prepar solut analysi weigh nearest sampl place small glass mortar grind sampl time water pour water grind ml graduat stohmann flask transfer quantit sampl ml graduat stohmann flask wash mortar pestl funnel water make water approxim ml add ml acet acid shake rotari shaker hour make ml water mix filter analysi carri quickli analysi solut transfer ml filtrat ml beaker add ammonia solut slightli alkalin add ml warm ammoniac silver nitrat order precipit yellow silver complex cyanamid leav overnight filter wash precipit cold water complet free ammonia place filter precipit moist kjeldahl flask add potassium sulphat catalyst prescrib proport ml water ml concentr sulphur acid warm flask slowli shake gentli content boil increas heat boil content flask colourless pale green continu boil hour leav cool transfer liquid quantit kjeldahl flask distil flask add anti bump granul pumic stone make water total volum approxim ml mix cool distil ammonia method variant ad suffici naoh solut ensur presenc consider excess blank test carri blank test omit sampl condit refer calcul final result control test carri analysi check apparatu work properli correct applic method aliquot part standard solut potassium thiocyan nitrogen express result express result percentag cyanamid nitrogen contain fertilis receiv analysi gt refer graphic gt method spectrophotometr determin biuret urea scope document defin procedur determin biuret urea field applic method appli exclus urea principl alkalin medium presenc potassium sodium tartrat biuret bival copper violet cupric compound absorb solut measur wave length nm nanomet reagent distil demineralis water free carbon dioxid ammonia qualiti water import determin methanol sulphur acid solut mol sodium hydroxid solut mol alkalin solut potassium sodium tartrat graduat litr flask dissolv sodium hydroxid ml water leav cool add potassium sodium tartrat nakc make mark leav stand hour solut copper sulphat graduat litr flask dissolv copper sulphat pentahydr cuso ml water make mark freshli prepar biuret standard solut ml graduat flask dissolv pure biuret water make ml ml solut biuret indic solut graduat ml flask dissolv methyl red ml ethanol make ml water filter insolubl remain apparatu spectromet photomet filter sensit precis permit measur reproduc graduat flask ml graduat pipett ml ml burett graduat ml ml beaker prepar sampl method procedur prepar calibr curv transfer ml aliquot biuret standard solut seri graduat ml flask make volum ml water add drop indic neutralis sulphur acid mol stir ml alkalin tartrat solut ml copper sulphat solut note solut measur precis burett pipett make ml distil water mix leav stand minut quot quot biuret standard solut refer measur absorb solut wavelength nm cell suitabl path length plot calibr curv absorb ordin quantiti biuret milligram abscissa prepar solut analys weigh nearest prepar sampl dissolv ml water ml graduat flask make mark filter remark sampl analysi ammoniac nitrogen dissolv ml beaker ml methanol reduc evapor volum ml transfer quantit graduat ml flask make mark water filter dry flute filter dry contain remark elimin opalesc colloid substanc present difficulti aris filter solut intend analysi case prepar dissolv sampl analysi ml water add ml mol hydrochlor acid filter solut flat fine filter graduat ml flask wash filter water make volum continu process method quot determin quot determin presum biuret content transfer ml solut mention pipett place quantiti ml graduat flask neutralis mol reagent requir methyl red indic add accuraci draw calibr curv ml alkalin solut potassium sodium tartrat ml copper solut make volum mix leav stand minut carri photometr measur calcul quantiti biuret present urea express result gt refer graphic gt quot quot mass milligram biuret read calibr graph quot quot volum aliquot appendix quot jo quot intens beam monochromat rai determin wavelength pass transpar bodi quot quot intens beam passag factor transmiss gt refer graphic gt opac gt refer graphic gt absorb gt refer graphic gt absorb unit optic run gt refer graphic gt coeffici specif absorb gt refer graphic gt thick layer centimetr concentr milligram litr specif factor substanc lambert beer law method determin form nitrogen sampl method determin form nitrogen sampl fertilis nitrogen nitric ammoniac urea cyanamid nitrogen scope document defin procedur determin form nitrogen presenc form field applic fertilis provid annex nitrogen form principl total solubl insolubl nitrogen list standard fertilis annex determin applic product calcium cyanamid absenc nitrat test sampl mineralis direct kjeldahl digest presenc nitrat test sampl mineralis kjeldahl digest reduct aid metal iron stannou chlorid case ammonia determin method note analysi show insolubl nitrogen content conclud fertilis form insolubl nitrogen includ list annex form solubl nitrogen determin aliquot solut sampl total solubl nitrogen absenc nitrat direct kjeldahl digest presenc nitrat kjeldahl digest aliquot part solut reduct ulsch ammonia determin case method total solubl nitrogen except nitrat nitrogen kjeldahl digest elimin acid medium nitrat nitrogen ferrou sulphat ammonia determin method nitrat nitrogen differ absenc calcium cyanamid total solubl nitrogen sum ammoniac nitrogen ureic organ nitrogen presenc calcium cyanamid sum ammoniac nitrogen sole presenc ammoniac nitrogen ammoniac nitrat nitrogen appli method presenc urea nitrogen cyanamid nitrogen cold distil make slightli alkalin ammonia absorb standard solut sulphur acid determin method urea nitrogen convers ureas ammonia titrat standard solut hydrochlor acid gravimetri xanthydrol precipit biuret count urea nitrogen great error content remain gener low absolut compound fertilis differ tabl gt tabl gt cyanamid nitrogen precipit silver compound nitrogen estim precipit kjeldahl method reagent distil demineralis water potassium sulphat analysi iron powder reduc hydrogen prescrib quantiti iron reduc mg nitrat nitrogen potassium thiocyan analysi potassium nitrat analysi ammonium sulphat analysi urea analysi dilut sulphur acid volum volum sulphur acid ml volum water standard solut sulphur acid mol concentr sodium hydroxid solut aqueou solut naoh free ammonia standard solut sodium potassium hydroxid mol free carbon stannou chlorid solut dissolv sncl ml concentr hydrochlor acid ml make litr water solut perfectli clear prepar immedi note essenti check reduc power stannou chlorid dissolv sncl ml concentr hydrochlor acid ml make ml water add rochel salt potassium sodium tartrat suffici quantiti sodium bicarbon solut alkalin litmu paper titrat mol iodin solut presenc starch solut indic ml mol iodin solut correspond sncl total tin present solut prepar bival form titrat ml mol iodin solut sulphur acid ml dilut hydrochlor acid volum hydrochlor acid ml volum water acet acid sulphur acid solut ferrou sulphat crystallin feso standard sulphur acid solut mol octyl alcohol satur solut potassium carbon standard solut sodium potassium hydroxid mol free carbon satur solut barium hydroxid sodium carbon solut hydrochlor acid mol standard solut hydrochlor acid mol ureas solut suspend activ ureas ml distil water hydrochlor acid mol adjust ph measur ph meter xanthydrol solut ethanol methanol product give high proport insolubl matter solut month stopper bottl light copper oxid cuo estim equival quantiti copper sulphat pentahydr cuso estim anti bump granul wash hydrochlor acid calcin indic solut solut dissolv methyl red ml sodium hydroxid solut mol make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop indic solut methyl red indic solut dissolv methyl red ml ethanol make ml water filter indic drop previou indic paper litmu bromothymol blue paper sensit ph ethanol methanol solut apparatu distil apparatu method apparatu estim ammoniac nitrogen analyt techniqu figur apparatu made special shape receptacl ground glass neck side neck connect tube splash head perpendicular tube introduct air tube connect receptacl mean simpl perfor rubber bung import give suitabl shape end tube introduc air bubbl ga perfectli distribut solut contain receptacl absorb arrang consist small mushroom shape piec extern diamet mm open mm peripheri apparatu estim urea nitrogen ureas techniqu consist ml erlenmey flask separ funnel small absorb figur rotari shaker turn minut ph meter adjust oven glasswar pipett ml long neck kjeldahl flask ml graduat flask ml crucibl sinter glass pore diamet mortar prepar sampl method analyt techniqu total solubl insolubl nitrogen absenc nitrat digest weigh accuraci quantiti sampl mg nitrogen place flask distil apparatu add potassium sulphat catalyst anti bump granul add ml dilut sulphur acid mix heat gentli mix time time foam longer form heat liquid boil regularli boil hour solut clear prevent organ matter stick side flask cool carefulli add ml water mix ensur dissolut complet cool connect flask distil apparatu distil ammonia transfer precis pipett receiv apparatu ml standard solut sulphur acid mol add indic ensur tip condens cm level solut take precaut avoid loss ammonia carefulli add distil flask concentr sodium hydroxid solut make liquid strongli alkalin ml gener suffici check ad drop phenolphthalein end distil solut flask alkalin adjust heat flask distil ml half hour test indic paper distil complet distil ml repeat test supplementari distil react neutral indic paper lower receiv distil millilitr rins tip condens titrat excess acid standard solut potassium sodium hydroxid mol indic colour blank test carri blank test omit sampl condit account calcul final result express result gt refer graphic gt ml standard solut sodium potassium hydroxid mol blank carri pipet receiv apparatu ml standard solut sulphur acid mol ml standard solut sodium potassium hydroxid mol analysi mass test sampl gram presenc nitrat test sampl mass accuraci quantiti sampl mg nitrat nitrogen reduct nitrat mix test sampl small mortar ml water transfer minimum amount distil water ml kjeldahl flask add reduc iron ml stannou chlorid solut shake leav stand half hour time stand stir minut kjeldahl digest add ml sulphur acid potassium sulphat prescrib quantiti catalyst anti bump granul heat gentli flask slightli tilt increas heat slowli shake solut frequent mixtur suspend liquid darken clear format yellow green anhydr iron sulphat suspens continu heat hour obtain clear solut maintain simmer point leav cool cautious content flask water add ml water mix transfer content flask ml graduat flask make volum water mix filter dry filter dry receptacl analysi solut transfer pipett flask distil apparatu aliquot mg nitrogen dilut ml distil water add anti bump granul connect flask distil apparatu continu estim blank test express result gt refer graphic gt ml standard solut sodium potassium hydroxid mol blank carri pipet receiv apparatu ml standard solut sulphur acid mol ml standard solut sodium potassium hydroxid mol analysi mass sampl express gram present aliquot part form solubl nitrogen prepar solut analys mass accuraci mg sampl place ml graduat flask case fertilis cyanamid nitrogen add flask ml water ml dilut hydrochlor acid shake leav stand evolut carbon dioxid ceas add ml water shake half hour rotari shaker make volum water mix filter dry filter dry receptacl case fertilis cyanamid nitrogen add flask ml water drop methyl red make solut acid acet acid add ml acet acid shake rotari shaker hour reacidifi solut oper acet acid make volum water mix filter immedi dry filter dry receptacl immedi estim cyanamid nitrogen case estim solubl form nitrogen dai solut made start cyanamid nitrogen urea nitrogen present total solubl nitrogen absenc nitrat pipett ml kjeldahl flask aliquot filtrat mg nitrogen add ml concentr sulphur acid copper oxid copper sulphat anti bump granul heat gentli begin digest higher temperatur liquid colourless slightli greenish white fume appar cool quantit transfer solut distil flask dilut ml water add anti bump granul connect flask distil apparatu continu determin presenc nitrat transfer precis pipett ml erlenmey aliquot filtrat mg nitrat nitrogen stage analysi total quantiti nitrogen import add ml sulphur acid reduc iron immedi cover erlenmey watch glass heat gentli reaction steadi vigor junctur stop heat flask stand hour ambient temperatur water quantit transfer liquid ml graduat flask leav undissolv iron make mark water mix transfer precis pipett ml kjeldahl flask aliquot mg nitrogen add ml concentr sulphur acid copper oxid copper sulphat anti bump granul heat gentli begin digest higher temperatur liquid colourless slightli greenish white fume appar cool quantit transfer solut distil flask dilut approxim ml water add anti bump granul connect flask distil apparatu continu determin blank test express result gt refer graphic gt ml standard solut sodium potassium hydroxid mol blank carri pipet receiv apparatu ml standard solut sulphur acid mol ml standard solut sodium potassium hydroxid mol analysi mass sampl express gram present aliquot part total solubl nitrogen except nitrat nitrogen transfer precis pipett ml kjeldahl flask aliquot sampl filtrat mg nitrogen determin dilut ml water add ferrou sulphat ml concentr sulphur acid anti bump granul heat gentli increas heat white fume continu digest minut stop heat introduc copper oxid catalyst temperatur white fume emit minut cool quantit transfer content kjeldahl flask distil flask apparatu dilut approxim ml water add anti bump granul connect flask distil apparatu continu determin blank test express result gt refer graphic gt ml standard solut sodium potassium hydroxid mol blank carri pipet receiv apparatu ml standard solut sulphur acid mol ml standard solut sodium potassium hydroxid mol analysi mass sampl express gram present aliquot part estim nitrat nitrogen absenc calcium cyanamid obtain differ result obtain result obtain sum result obtain presenc calcium cyanamid obtain differ result obtain result obtain sum result obtain ammoniac nitrogen sole presenc ammoniac nitrogen ammoniac nitrat nitrogen transfer precis pipett flask distil apparatu aliquot sampl filtrat mg ammoniac nitrogen add water obtain total volum ml anti bump granul facilit boil connect flask distil apparatu add ml sodium hydroxid solut distil express result gt refer graphic gt ml standard solut sodium potassium hydroxid mol blank carri pipet receiv apparatu ml standard solut sulphur acid mol ml standard solut sodium potassium hydroxid mol analysi mass sampl express gram present aliquot part estim presenc urea cyanamid nitrogen transfer precis pipett dry flask apparatu aliquot sampl filtrat mg ammoniac nitrogen assembl apparatu pipett ml erlenmey ml standard sulphur acid solut mol distil water level liquid approxim cm open deliveri tube introduc side neck reaction flask distil water make volum ml mix avoid foam aerat add drop octyl alcohol make solut alkalin ml satur potassium carbon solut immedi begin expel ammonia liber cold suspens strong current air end flow approxim litr minut purifi pass wash flask dilut sulphur acid dilut sodium hydroxid pressuris air work vacuum water pump provid inflow tube connect suffici airtight manner receptacl recov ammonia elimin ammonia gener complet hour wise make chang receiv flask oper finish separ flask apparatu rins tip tube side flask distil water titrat excess acid standard solut sodium hydroxid mol indic turn grei blank test express result gt refer graphic gt ml standard solut sodium potassium hydroxid mol blank carri pipet ml erlenmey apparatu ml standard solut sulphur acid mol ml standard solut sodium potassium hydroxid mol analysi mass sampl express gram present aliquot part analysi urea nitrogen ureas method transfer precis pipett ml graduat flask aliquot filtrat mg urea nitrogen precipit phosphat add satur barium hydroxid solut precipit occur elimin excess barium ion dissolv calcium ion aid sodium carbon solut leav settl check total precipit occur make mark mix filter pleat filter pipett ml filtrat ml erlenmey apparatu acidifi filtrat hydrochlor acid mol ph measur ph meter obtain rais ph sodium hydroxid mol avoid loss ammonia decomposit ureas close erlenmey stopper provid separ funnel small bubbl trap ml standard solut hydrochlor acid mol introduc separ funnel ml ureas solut leav stand hour pipett ml standard solut hydrochlor acid mol separ funnel run solut rins water quantit transfer content protect receptacl solut contain erlenmey titrat excess acid standard solut sodium hydroxid mol ph obtain measur ph meter blank test express result gt refer graphic gt ml standard solut sodium potassium hydroxid mol blank carri condit analysi ml standard solut sodium potassium hydroxid mol analysi mass sampl express gram present aliquot part analysi remark precipit solut barium hydroxid sodium carbon make mark filter neutralis rapidli titrat test carri indic end point difficult observ gravimetr method xanthydrol transfer precis pipett ml beaker aliquot filtrat mg urea add ml acet acid stir glass rod minut leav precipit settl minut filter flat bed ml beaker wash millilitr acet acid add filtrat drop drop ml xanthydrol stir continu glass rod leav settl precipit appear junctur stir minut leav stand half hour filter glass filter crucibl previous dri weigh press slightli wash time ml ethanol elimin acet acid place oven temperatur hour leav cool desicc weigh express result gt refer graphic gt mass precipit obtain gram mass sampl express gram present aliquot part estim correct blank biuret gener speak measur urea nitrogen great error content remain small absolut compound fertilis method differ urea nitrogen calcul tabl gt tabl gt cyanamid nitrogen aliquot part filtrat mg cyanamid nitrogen place ml beaker continu analysi method verif result case differ found total nitrogen obtain directli weigh sampl total solubl nitrogen differ greater case fertilis form insolubl nitrogen contain list annex analysi check apparatu work properli correct applic method standard solut includ form nitrogen proport similar test sampl standard solut prepar standard solut potassium thiocyan potassium nitrat ammonium sulphat urea figur apparatu estim ammoniac nitrogen gt pic file quot en tif quot gt figur apparatu estim urea nitrogen gt pic file quot en tif quot gt method determin form nitrogen fertilis nitrogen nitric ammoniac urea nitrogen object purpos present document simplifi method determin form nitrogen fertilis nitrogen nitric ammoniac urea nitrogen field applic present method fertilis mention annex exclus nitric ammoniac urea nitrogen principl determin made portion singl sampl solut total solubl nitrogen absenc nitrat direct kjeldahl digest solut presenc nitrat kjeldahl digest portion solut reduct ulsch method ammonia determin case method total solubl nitrogen nitric nitrogen kjeldahl digest elimin nitric nitrogen acid medium mean ferrou sulphat ammonia determin method nitric nitrogen differ total solubl nitrogen sum ammoniac urea nitrogen ammoniac nitrogen cold distil slight alkalinis ammonia obtain solut sulphur acid determin method urea nitrogen transform ureas ammonia determin titrat standard solut hydrochlor acid gravimetri xanhydrol precipit biuret urea nitrogen error level small absolut compound fertilis differ tabl gt tabl gt reagent distil demineralis water potassium sulphat analysi iron analysi hydrogen reduc amount iron reduc mg nitrat nitric potassium nitrat analysi ammonium sulphat analysi urea analysi sulphur acid solut mol concentr sodium hydroxid solut approxim aqueou solut naoh free ammonia sodium potassium hydroxid solut mol free carbon sulphur acid densiti ml dilut hydrochlor acid volum hydrochlor acid ml volum water acet acid sulphur acid solut approxim free ammonia ferrou sulphat crystallin feso titrat sulphur acid solut mol octyl alcohol satur potassium carbon solut sodium potassium hydroxid mol satur barium hydroxid solut sodium carbon solut hydrochlor acid mol hydrochlor acid solut mol ureas solut make suspens activ ureas ml distil water mol hydrochlor acid adjust ph measur ph meter xanthydrol solut ethanol methanol product give high proport insolubl materi solut month carefulli stopper bottl dark catalyst copper oxid cuo determin equival amount copper sulphat pentahydr cuso determin pumic stone granul wash hydrochlor acid calcin indic solut mix indic solut dissolv methyl red ml mol sodium hydroxid solut make litr water solut dissolv methylen blue water make litr mix volum volum indic violet acid solut grei neutral solut green alkalin solut ml drop indic methyl red indic solut dissolv methyl red ml ethanol make ml water filter drop indic previou indic paper litmu bromothymol blue paper sensit ph ethanol methanol apparatu distil apparatu method apparatu determin ammoniac nitrogen method figur apparatu determin urea nitrogen ureas techniqu method figur rotari shaker turn minut ph meter glasswar precis pipett ml long neck kjeldahl flask ml graduat flask ml crucibl sinter glass pore diamet µm mortar prepar sampl method method prepar solut analysi weigh accuraci mg sampl transfer ml graduat flask add ml water ml dilut hydrochlor acid shake rest releas end add ml water shake half hour make volum water homogenis filter dry filter dry contain total nitrogen absenc nitrat pipett ml kjeldahl flask portion filtrat maximum mg add ml concentr sulphur acid copper oxid copper sulphat glass bead control boil heat moder order initi reaction strongli liquid colourless slightli greenish white fume unmistak cool transfer solut distil flask dilut approxim ml water add granul pumic stone connect flask distil apparatu carri determin method presenc nitrat pipett ml erlenmey portion filtrat mg nitric stage analysi total quantiti unimport add ml sulphur acid reduc iron immedi cover erlenmey watch glass heat gentli reaction strong violent stop heat leav hour ambient temperatur transfer liquid quantit ml graduat flask ignor undissolv iron make mark water homogenis carefulli pipett portion maximum mg ml kjeldahl flask add ml concentr sulphur acid copper oxid copper sulphat glass bead control boil heat moder order initi reaction strongli liquid colourless slightli greenish white fume unmistak cool transfer solut quantit distil flask dilut approxim ml water add granul pumic stone connect flask distil apparatu continu determin method blank test carri blank test omit sampl condit result calcul final result express result gt refer graphic gt ml titrat mol sodium potassium hydroxid solut blank test carri place ml titrat mol sulphur acid solut receiv apparatu ml titrat mol sodium potassium hydroxid solut analysi mass test sampl gram present aliquot total nitrogen exclud nitric analysi pipett ml kjeldahl flask aliquot filtrat mg determin dilut ml water add ferrou sulphat ml concentr sulphur acid glass bead control boil heat moder strongli white fume continu reaction minut stop heat introduc copper oxid copper sulphat catalyst resum heat maintain product white fume minut cool transfer content kjeldahl flask quantit distil flask dilut approxim ml water add granul pumic stone connect flask distil apparatu continu determin method blank test express result gt refer graphic gt ml titrat mol sodium potassium hydroxid solut blank test carri pipet ml titrat mol sulphur acid solut receiv apparatu ml titrat mol sodium potassium hydroxid solut analysi mass sampl express gram present aliquot determin nitric nitrogen obtain differ ammoniac nitrogen analysi pipett dry flask apparatu portion filtrat maximum mg ammoniac connect apparatu pipett ml erlenmey ml titrat mol sulphur acid solut amount distil water level liquid approxim cm open intak tube introduc side neck reaction flask distil water bring volum approxim ml shake order avoid format froth introduct gaseou flow add drop octyl alcohol add ml satur potassium carbon solut immedi begin expel ammonia releas cold suspens intens air flow requir purpos flow rate approxim litr minut previous purifi passag wash flask dilut sulphur acid dilut sodium hydroxid air pressur vacuum water suction pump provid connect apparatu air tight elimin ammonia gener complet hour desir make chang erlenmey process finish separ erlenmey apparatu rins end intak tube erlenmey wall distil water titrat excess acid standard mol sodium hydroxid solut blank test express result gt refer graphic gt ml titrat mol sodium potassium hydroxid solut blank test carri pipet ml erlenmey apparatu ml titrat mol sulphur acid solut ml titrat mol sodium potassium hydroxid solut analysi mass sampl express gram present aliquot analysi urea nitrogen ureas method pipett ml graduat flask portion filtrat mg urea nitrogen precipit phosphat add suitabl quantiti satur barium hydroxid solut addit product precipit elimin excess barium ion dissolv calcium ion mean sodium carbon solut settl check precipit complet make mark homogenis filter folder filter pipett ml filtrat ml erlenmey apparatu acidifi mol hydrochlor acid ph measur mean ph meter rais ph mean mol sodium hydroxid avoid ammonia loss hydrolysi ureas occur close erlenmey mean stopper attach drop funnel small protect contain hold ml mol hydrochlor acid solut drop funnel introduc ml ureas solut leav hour pipett ml standard mol hydrochlor acid solut drop funnel run solut rins water transfer quantit content protect contain solut held erlenmey titrat excess acid standard mol sodium hydroxid solut ph obtain measur ph meter remark precipit barium hydroxid sodium carbon solut make mark filter neutralis quickli titrat assess indic chang colour difficult observ blank test express result gt refer graphic gt ml titrat mol sodium potassium hydroxid solut blank test carri condit analysi ml titrat mol sodium potassium hydroxid solut analysi sampl mass express gram present aliquot analysi gravimetr method xanthydrol pipett ml beaker portion filtrat mg urea add ml acet acid stir glass rod minut precipit settl minut filter wash millilitr acet acid add ml xanthydrol filtrat drop drop stir continu glass rod leav settl precipit appear junctur stir minut leav half hour filter glass filtrat crucibl previous dri weigh slight reduct pressur wash time ml ethanol aim elimin acet acid transfer oven maintain hour exce cool desicc weigh express result gt refer graphic gt mass precipit obtain gram mass sampl gram present aliquot determin make correct blank biuret gener urea nitrogen larg error level small absolut compound fertilis differ method urea calcul tabl gt tabl gt verif result analysi check function apparatu correct applic method standard solut form nitrogen proport similar sampl standard solut prepar titrat solut potassium nitrat ammonium sulphat urea method phosphoru method extract method extract phosphoru solubl miner acid scope document describ procedur determin phosphoru solubl miner acid field applic applic exclus phosphat fertilis list annex principl extract phosphoru fertilis mixtur nitric acid sulphur acid reagent distil demineralis water sulphur acid ml nitric acid ml equip standard laboratori equip kjeldahl flask capac ml ml round bottom flask glass tube form reflux condens ml graduat flask prepar sampl method procedur sampl weigh nearest prepar sampl place dry kjeldahl flask extract add ml water stir suspend substanc add ml nitric acid carefulli add ml sulphur acid initi violent reaction ceas slowli bring content flask boil boil minut cool carefulli add mix ml water continu boil minut cool complet transfer liquid quantit ml graduat flask make volum mix filter dry pleat filter free phosphat discard portion filtrat determin determin phosphoru carri method aliquot part solut obtain method extract phosphoru solubl formic acid litr scope document defin procedur determin phosphoru solubl formic acid litr field applic soft natur phosphat exclus principl differenti hard natur phosphat soft natur phosphat phosphoru solubl formic acid extract specif condit reagent formic acid litr note make ml formic acid concentr ml litr distil water apparatu standard laboratori equip ml graduat flask stohmann rotari shaker turn minut prepar sampl method procedur sampl weigh nearest prepar sampl place dry ml graduat stohmann flask wide neck extract continu rotat flask hand add formic acid approxim cm graduat mark make volum close flask rubber stopper shake minut rotari shaker filter solut dry pleat filter free phosphat dry glass receptacl discard portion filtrat determin determin phosphoru method aliquot part complet clear filtrat method extract phosphoru solubl citric acid litr scope document defin procedur determin phosphoru solubl citric acid litr field applic applic type basic slag annex principl extract phosphoru fertilis citric acid solut litr condit reagent distil demineralis water citric acid solut litr prepar crystallis citric acid note verifi concentr citric acid solut titrat ml sodium hydroxid standard solut mol phenolphtalein indic solut correct ml standard solut apparatu rotari shaker turn minut prepar sampl analysi carri product receiv carefulli mix origin sampl ensur homogen method procedur sampl weigh nearest prepar sampl place dry flask suffici wide neck capac ml allow liquid shaken extract add ml citric acid solut ad millilitr reagent shake vigor hand stop format lump prevent substanc stick side close flask rubber stopper shake rotari shaker minut temperatur filter immedi dry pleat filter free phosphat dry glass receiv discard ml filtrat continu filter suffici quantiti filtrat obtain carri phosphoru determin determin determin phosphoru extract carri method aliquot part solut obtain method extract phosphoru solubl neutral ammonium citrat scope document defin procedur determin phosphoru solubl neutral ammonium citrat field applic fertilis respect solubl neutral ammonium citrat laid annex principl extract phosphoru temperatur neutral ammonium citrat solut ph specif condit reagent distil demineralis water neutral ammonium citrat solut ph solut litr crystallis citric acid specif graviti ph reagent prepar dissolv crystallin citric acid litr water make approxim neutral solut ad ml ammonium hydroxid solut nh nh concentr lower add correspondingli larger quantiti ammonium hydroxid solut dilut citric acid correspondingli smaller quantiti water cool make neutral keep electrod ph meter immers solut add ammonia nh drop drop stir continu mechan stirrer obtain ph temperatur point make volum litr test ph reagent close contain check ph regular interv apparatu litr beaker ph meter ml erlenmey flask ml graduat flask ml graduat flask water bath set thermostat equip suitabl stirrer figur prepar sampl method procedur sampl transfer fertilis analys annex regul ml erlenmey flask ml ammonium citrat solut previous heat analysi solut stopper erlenmey flask shake order suspend fertilis form lump remov stopper instant order balanc pressur close erlenmey flask place flask water bath set maintain content flask connect stirrer figur stir level suspens flask stai constantli level water water bath mechan stir regul ensur complet suspens stir hour remov erlenmey flask water bath cool immedi run water ambient temperatur immedi quantit transfer content erlenmey flask graduat ml flask jet water wash bottl make volum water mix filter dry pleat filter medium speed phosphat free dry contain discard part filtrat ml ml clear filtrat collect determin determin phosphoru extract obtain method figur gt pic file quot en tif quot gt method extract alkalin ammonium citrat method extract solubl phosphoru petermann scope document defin procedur determin solubl phosphoru alkalin ammonium citrat field applic exclus precipit dihydr dicalcium phosphat cahpo principl extract phosphoru temperatur alkalin solut ammonium citrat petermann condit reagent distil water demineralis water characterist distil water petermann solut characterist citric acid litr ammonia litr ammoniac nitrogen ph prepar diammonium citrat dissolv diammonium citrat molecular mass ml water litr standard flask stand bath run water mix cool add small amount ammonia ml level mass ammoniac nitrogen ml ammonia solut adjust temperatur make volum distil water mix prepar citric acid ammonia dissolv citric acid monohydr ml distil water contain litr capac place contain ic bath add small amount shake constantli ammonia solut funnel stem immers citric acid solut ml level mass ammoniac nitrogen add ml ammonia solut adjust temperatur transfer litr standard flask make mark distil water mix check ammoniac nitrogen content transfer ml solut ml standard flask make volum distil water mix determin ammoniac content ml solut method solut correct ml mol strength ammoniac nitrogen greater litr nh expel stream inert ga moder heat bring back ph carri determin strength ammoniac nitrogen litr add mass ammonia solut gt refer graphic gt volum gt refer graphic gt ml add directli litr flask mass powder citric acid greater ml conveni make litr reagent weigh citric acid dissolv ml water take precaut add ml ammonia solut prepar litr reagent make volum water mix mix litr ml previous prepar apparatu water bath maintain temperatur ml graduat flask stohmann prepar sampl method procedur sampl weigh nearest prepar sampl transfer ml graduat flask extract add ml alkalin ammonium citrat solut stopper flask shake vigor hand avoid format lump prevent adher substanc side place flask water bath set shake minut half hour shake rais stopper equilibr pressur level water water bath level solut flask flask remain water bath hour shake minut remov flask cool temperatur make volum ml water mix filter dry flute filter paper free phosphat reject portion filtrat determin determin phosphat extract carri method aliquot part solut obtain method extract solubl phosphoru petermann ambient temperatur scope document defin procedur determin phosphoru solubl cold alkalin ammonium citrat field applic disintegr phosphat exclus principl extract phosphoru temperatur alkalin solut ammonium citrat petermann solut specif condit reagent method apparatu standard laboratori equip ml graduat flask stohmann rotari shaker turn minut prepar sampl method procedur sampl weigh nearest prepar sampl place ml graduat flask extract add petermann solut shake hard order stop format lump prevent substanc adher side flask make graduat mark petermann solut close flask rubber stopper shake hour rotari shaker filter immedi dry pleat filter free phosphat dry contain discard portion filtrat determin phosphoru determin carri method aliquot part solut obtain method extract phosphoru solubl jouli alkalin ammonium citrat scope document defin procedur determin phosphoru solubl jouli alkalin ammonium citrat field applic straight compound phosphat fertilis phosphat occur alumino calcic form principl extract shake vigor alkalin solut ammonium citrat defin specif presenc oxin reagent destil demineralis water jouli alkalin solut ammonium citrat solut citric acid nh litr free ammonia content approxim litr prepar method litr graduat flask dissolv citric acid approxim ml ammonia ml nh litr citric acid ad success quantiti maintain temperatur make volum litr ammonia litr graduat flask dissolv dibas ammonium citrat ml water add ml ammonia ml make volum litr water note verif total ammonia content ml sampl citrat solut place ml flask make volum distil water determin ammoniac nitrogen content ml solut method ml mol nh condit reagent consid correct number millilitr found titrat li ml add ml ammonia ml ml powder hydroxyquinolin oxin apparatu standard laboratori equip small mortar glass porcelain pestl ml graduat flask ml graduat flask rotari shaker turn minut prepar sampl method procedur sampl weigh nearest prepar sampl place small mortar add drop citrat moisten break carefulli pestl extract add ml ammonium citrat mix past leav settl minut decant liquid ml graduat flask strain particl escap preced moist disintegr add ml citrat solut residu grind decant liquid graduat flask repeat process time end time product pour flask total quantiti citrat process approxim ml rins pestl mortar graduat flask ml distil water stopper flask shaken hour rotari shaker leav flask stand hour shake condit hour temperatur process make graduat mark distil water filter dry filter discard portion filtrat collect clear filtrat dry flask determin estim extract phosphoru carri method aliquot part solut obtain appendix oxin make appli method fertilis magnesium recommend ratio magnesium phosphor anhydrid content higher mg amp gt case add oxin moisten sampl analysi oxin absenc magnesium interfer subsequ determin absenc magnesium oxin method extract water solubl phosphoru scope document defin procedur determin water solubl phosphoru field applic fertilis includ compound fertilis water solubl phosphoru determin principl extract water shake specif condit reagent distil demineralis water apparatu ml graduat flask stohmann rotari shaker turn minut prepar sampl method procedur sampl weigh nearest prepar sampl place ml graduat flask extract add flask ml water temperatur shake rotari shaker minut make mark water mix shake filter dry pleat filter free phosphat dry contain determin estim phosphoru carri aliquot part solut obtain method method determin extract phosphoru gravimetr method quinolin phosphomolybd scope document defin procedur determin phosphoru extract fertilis field applic method applic extract fertilis determin form phosphoru principl hydrolysi form phosphoru orthophosph orthophosph ion precipit acid medium form quinolin phosphomolybd filter wash precipit dri weigh abovement condit interf action exert compound found solut miner organ acid ammonium ion solubl silic reagent base sodium molybd ammonium molybd precipit reagent distil demineralis water concentr nitric acid ml prepar reagent prepar reagent base sodium molybd solut dissolv sodium molybd dihydr ml distil water solut dissolv citric acid monhydr ml distil water add ml concentr nitric acid solut stir solut solut obtain solut solut ml distil water add ml concentr nitric acid ml freshli distil quinolin add solut solut mix leav stand overnight dark make ml distil water mix filter sinter glass funnel prepar reagent base ammonium molybd solut ml distil water dissolv ammonium molybd heat gentli stir time time solut dissolv citric acid monohydr ml distil water add ml concentr nitric acid solut add ml freshli distil quinolin ml concentr nitric acid solut slowli pour stir solut solut mix add solut mixtur make litr leav stand dai dark place filter sinter glass funnel reagent dark stopper polyethylen bottl apparatu standard laboratori equip ml erlenmey flask wide neck graduat pipett ml filter crucibl poros µm buchner flask dry oven regul sinter glass funnel poros µm procedur treatment solut pipett aliquot part fertilis extract tabl put ml erlenmey flask add ml concentr nitric acid dilut water ml tabl determin aliquot part phosphat solut gt tabl gt hydrolysi presenc metaphosph pyrophosph polyphosph suspect solut hydrolysi carri bring content erlenmey flask boil slowli temperatur hydrolysi complet take hour care avoid loss splash excess evapor reduc initi volum half fit reflux condens hydrolysi make initi volum distil water weigh crucibl dry filter crucibl minut dry oven set weigh cool desicc precipit acid solut contain erlenmey flask heat begin boil precipit quinolin phosphomolybd start ad ml precipit reagent reagent drop drop stir continu place erlenmey flask steam bath leav minut shake time time solut filter immedi cool filter wash filter solut vacuum decant wash precipit erlenmey flask ml water decant filter solut repeat process time quantit transfer rest precipit crucibl wash water wash time ml water allow liquid drain crucibl addit dry precipit dry weigh wipe crucibl filter paper place crucibl dry oven mass remain constant temperatur minut leav cool desicc ambient temperatur weigh rapidli blank test seri determin carri blank test reagent solvent proport extract citrat solut calcul final result verif carri determin aliquot part potassium dihydrogen phosphat solut express result sampl analysi dilut shown tabl formula appli gt refer graphic gt gt refer graphic gt mass gram quinolin phosphomolybd mass gram quinolin phosphomolybd obtain blank test factor column tabl sampl analysi dilut differ tabl formula appli gt refer graphic gt gt refer graphic gt convers factor quinolin phosphomolybd dilut factor mass gram sampl analys method potassium method determin water solubl potassium content scope document defin procedur determin water solubl potassium field applic potassium fertilis list annex principl potassium sampl analys dissolv water elimin fix substanc interfer quantit determin potassium precipit slightli alkalin medium form potassium tetraphenylbor reagent distil demineralis water formaldehyd clear formaldehyd solut potassium chlorid analysi sodium hydroxid solut mol care ensur potassium free sodium hydroxid indic solut dissolv phenolphthalein ethanol make volum ml edta solut dissolv dihydr disodium salt ethylenediaminetetraacet acid water ml graduat flask make volum mix store reagent plastic contain stpb solut dissolv sodium tetraphenylbor ml water add ml sodium hydroxid solut ml magnesium chlorid solut mgcl litr stir minut filter fine ashless filter store reagent plastic contain liquid wash dilut ml stpb solut ml water bromin water satur bromin solut water apparatu ml graduat flask ml beaker filter crucibl poros oven regul desicc prepar sampl method case potassium salt sampl ground fine order repres sampl obtain analysi product method procedur sampl weigh nearest prepar sampl potassium salt potassium oxid place test sampl ml beaker approxim ml water bring boil boil minut cool transfer quantit ml graduat flask make volum mix filter dry receiv discard ml filtrat note procedur prepar aliquot part precipit transfer pipett aliquot part filtrat mg potassium tabl place ml beaker requir make ml water remov interfer add ml edta solut drop phenolphtalein solut stir drop drop sodium hydroxid solut turn red final add drop sodium hydroxid ensur excess ml sodium hydroxid suffici neutralis sampl ensur excess elimin ammonia note procedur boil gentli minut add water make volum ml bring solut boil remov beaker heat add ml formaldehyd add drop phenolphtalein sodium hydroxid distinct red colour appear cover beaker watch glass place steam bath minut weigh crucibl dry filter crucibl quot apparatu quot constant mass minut oven crucibl cool desicc weigh precipit remov beaker steam bath stir drop drop ml stpb solut addit take minut wait minut filter filter wash filter vacuum weigh crucibl rins beaker liquid wash wash precipit time liquid wash ml liquid wash ml water dry precipit dry weigh wipe crucibl filter paper place crucibl content oven half hour temperatur crucibl cool desicc ambient temperatur weigh rapidli note procedur filtrat dark colour transfer pipett aliquot part mg place ml graduat flask add bromin water bring boil elimin surplu bromin cool make volum filter quantit determin potassium aliquot part filtrat ammoniac nitrogen present boil minut aliquot part sampl convers factor tabl method gt tabl gt blank test seri determin carri blank test reagent proport analysi calcul final result control test order obtain control method analysi carri determin aliquot part aqueou solut potassium chlorid mg express result sampl analysi dilut shown tabl formula appli gt refer graphic gt gt refer graphic gt mass gram precipit sampl mass gram precipit blank factor tabl sampl dilut differ shown tabl formula gt refer graphic gt gt refer graphic gt convers factor ktpb convers factor ktpb dilut factor mass gram sampl analysi method item method chlorin method determin chlorid absenc organ materi scope document defin procedur determin chlorid absenc organ materi field applic fertilis free organ materi principl chlorid dissolv water precipit acid medium excess standard solut silver nitrat excess titrat solut ammonium thiocyan presenc ferric ammonium sulphat volhard method reagent distil demineralis water free chlorid nitrobenzen diethyl ether nitric acid mol indic solut dissolv ferric ammonium sulphat fe nh water make litr silver nitrat standard solut mol prepar salt hygroscop dri risk decomposit advis weigh approxim dissolv water make volum litr adjust mol strength titrat agno mol apparatu rotari shaker turn minut burett ml graduat flask conic erlenmey flask ml prepar sampl method procedur sampl prepar solut place sampl weigh nearest ml graduat flask add ml water mix half hour shaker make ml distil water mix filter beaker determin aliquot part filtrat chlorid ml ml ml sampl smaller ml make volum ml distil water add ml nitric acid mol ml indic solut drop ammonium thiocyan standard solut sampl reagent burett adjust purpos burett add silver nitrat standard solut excess ml add ml nitrobenzen ml diethyl ether shake agglomer precipit titrat excess silver nitrat ammonium thiocyan mol red brown colour appear remain flask shaken slightli note nitrobenzen diethyl ether nitrobenzen prevent silver chlorid react thiocyan ion clear colour chang obtain blank test carri blank test omit sampl condit calcul final result control test carri estim check accuraci method aliquot part freshli prepar solut potassium chlorid part quantiti order mg chlorid express result express result analysi percentag chlorid contain sampl receiv analysi calcul percentag chlorid cl formula gt refer graphic gt vz number millilitr silver nitrat mol vcz number millilitr silver nitrat mol blank test va number millilitr ammonium thiocyan mol vca number millilitr ammonium thiocyan mol blank test mass gram sampl method fine grind method determin fine grind dry procedur scope document defin dry procedur determin fine grind field applic ec type fertilis requir fine grind mm siev principl mechan siev shake quantiti product granul size greater mm granul size mm determin percentag fine grind calcul apparatu mechan siev shaker siev apertur mm standard rang cm diamet cm high procedur weigh nearest substanc assembl siev collect contain shaker siev larger apertur top place sampl analysi top siev minut remov part collect bottom start apparatu minut check amount collect bottom time mg repeat process minut time amount collect mg weigh residu materi siev separ express result gt refer graphic gt gt refer graphic gt mass gram residu siev mm apertur mass gram residu siev mm apertur reject siev mm apertur elimin result calcul round nearest unit method determin fine grind soft natur phosphat scope method determin fine grind soft natur phosphat field applic soft natur phosphat principl sampl fine particl size agglomer occur make dry siev difficult reason wet siev reagent sodium hexametaphosph solut apparatu siev apertur mm standard rang diamet cm height cm collect contain glass funnel cm diamet mount stand ml beaker dry oven method analysi sampl weigh nearest substanc wash side siev water place siev mm apertur mm siev procedur place sampl analysi top siev siev small jet cold water tap water water practic clear pass care ensur flow water lower siev fill water residu top siev remain constant remov siev place collect contain continu wet siev lower siev minut water pass clear replac mm siev mm siev transfer deposit collect contain top siev begin siev small jet water water clear quantit transfer residu beaker mean funnel suspend residu fill beaker water leav stand minut decant water place beaker dry oven hour cool detach residu brush weigh express result result calcul round nearest unit gt refer graphic gt gt refer graphic gt mass gram residu mm siev mass gram residu mm siev remark presenc lump observ siev analysi carri slowli pour sampl litr flask ml sodium hexametaphosph solut stir continu stopper flask shake vigor hand break lump transfer suspens top siev wash flask continu analysi method secondari nutrient method extract total calcium total magnesium total sodium total sulphur form sulphat scope document defin procedur extract total calcium total magnesium total sodium extract total sulphur present form sulphat extract determin nutrient requir field applic method appli ec fertilis declar total calcium total magnesium total sodium total sulphur form sulphat provid regul principl solubilis boil dilut hydrochlor acid reagent dilut hydrochlor acid volum hydrochlor acid ml volum water apparatu electr hot plate adjust temperatur prepar sampl method procedur test sampl calcium magnesium sodium sulphur form sulphat extract test sampl gram weigh milligram fertilis sulphur calcium ca cao extract calcium sulphur carri test sampl gram weigh milligram place test sampl millilitr beaker prepar solut add approxim millilitr water take care sampl signific quantiti carbon millilitr dilut hydrochlor acid small amount time bring boil maintain minut cool stir occasion decant quantit millilitr graduat flask make volum water mix pass dry filter dry contain discard initi portion extract complet transpar stopper filtrat immedi method extract total sulphur present form scope document defin procedur extract total sulphur contain fertilis element form chemic combin field applic method appli ec fertilis declar total sulphur present form element thiosulph sulphit sulphat provid regul principl element sulphur convert alkalin medium polysulphid thiosulph sulphit present oxidis hydrogen peroxid form sulphur convert sulphat determin precipit barium sulphat method reagent dilut hydrochlor acid volum hydrochlor acid volum water sodium hydroxid solut naoh minimum hydrogen peroxid solut aqueou solut barium chlorid bacl gram litr apparatu electr hot plate adjust temperatur prepar sampl method procedur test sampl weigh milligram quantiti fertilis milligram sulphur milligram rule amp lt weigh gram place test sampl millilitr beaker oxid add millilitr sodium hydroxid solut millilitr water cover watch glass boil minut hot plate remov hot plate jet hot water collect sulphur stick side beaker boil minut leav cool add millilitr increment hydrogen peroxid reaction observ ml hydrogen peroxid oxid continu hour bring boil half hour leav cool prepar solut analys add approxim millilitr water millilitr hydrochlor acid solut level sulphur filter millilitr beaker wash residu filter time cold water wash check absenc sulphat drop filtrat barium chlorid solut filtrat perfectli clear sulphat determin filtrat accord method level sulphur transfer quantit millilitr volumetr flask make volum water mix filter dry filter dry contain filtrat complet clear stopper solut immedi determin sulphat aliquot solut precipit form barium sulphat method method extract water solubl calcium magnesium sodium sulphur form sulphat scope document defin procedur extract water solubl calcium magnesium sodium sulphur form sulphat extract determin nutrient requir field applic method appli sole fertilis declar water solubl calcium magnesium sodium sulphur form sulphat provid annex principl nutrient solubilis boil water reagent distil demineralis water equival qualiti apparatu electr hot plate adjust temperatur prepar sampl method procedur test sampl fertilis sulphur time sulphur calcium ca cao weigh gram fertilis milligram fertilis sulphur calcium ca weigh gram fertilis milligram place test sampl millilitr beaker prepar solut add approxim millilitr water boil minut cool stir occasion decant quantit millilitr graduat flask make volum water mix filter dry filter dry contain discard initi portion filtrat filtrat complet transpar stopper solut immedi method extract water solubl sulphur sulphur form scope document defin procedur extract water solubl sulphur contain fertilis form field applic method appli fertilis declar water solubl sulphur trioxid provid annex principl sulphur dissolv cold water convert sulphat oxid hydrogen peroxid alkalin medium reagent dilut hydrochlor acid volum hydrochlor acid ml volum water sodium hydroxid solut naoh ml hydrogen peroxid solut apparatu millilitr graduat stohmann flask rotari shaker turn minut electr hot plate adjust temperatur prepar sampl method procedur test sampl fertilis maximum sulphur maximum calcium ca cao weigh gram fertilis milligram fertilis sulphur calcium ca weigh gram fertilis milligram place test sampl millilitr flask prepar solut add approxim millilitr water stopper shake minut make volum water mix pass dry filter dry contain stopper solut immedi oxid aliquot portion analys aliquot portion extract solut exceed millilitr milligram sulphur make volum millilitr water add millilitr sodium hydroxid solut millilitr hydrogen peroxid solut cover watch glass boil gentli hour hot plate ad millilitr increment hydrogen peroxid solut long reaction continu maximum quantiti millilitr leav cool remov watch glass wash undersid beaker add approxim millilitr dilut hydrochlor acid make approxim millilitr water determin content sulphat oxidis solut accord method method extract determin element sulphur warn method analysi involv carbon disulphid cs special safeti measur regard storag cs protect equip staff occup hygien prevent fire explos dispos reagent method requir highli skill staff suitabl equip laboratori scope defin procedur extract determin element sulphur contain fertilis field applic method appli ec fertilis declar total sulphur element form provid annex principl remov solubl compound element sulphur extract carbon disulphid gravimetr determin sulphur extract reagent carbon disulphid apparatu millilitr extract flask ground glass stopper soxhlet apparatu filter element vacuum rotari evapor electr oven fan assist set porcelain petri dish centimetr diamet exceed centimetr height electr hot plate adjust temperatur prepar sampl method procedur test sampl weigh ten gram sampl accuraci milligram place thimbl soxhlet apparatu extract sulphur wash content hot water remov solubl compound dry oven hour place filter soxhlet apparatu place glass bead flask apparatu weigh add millilitr carbon disulphid connect apparatu leav element sulphur extract hour switch heat cool disconnect flask connect flask rotari evapor evapor content flask solidifi spongi mass dry flask oven gener hour constant mass obtain determin puriti element sulphur substanc extract carbon disulphid time element sulphur puriti element sulphur determin homogenis content flask remov gram weigh accuraci milligram place petri dish weigh dish content place hot plate set temperatur exceed combust sulphur continu sublim hour constant mass obtain note fertilis determin pure sulphur case omit step express result percentag element sulphur content fertilis gt refer graphic gt gt refer graphic gt gt refer graphic gt mass test sampl fertilis gram mass soxhlet flask gram mass soxhlet flask impur sulphur dry mass impur sulphur purifi gram mass petri dish mass petri dish sublim sulphur gram method manganimetr determin extract calcium precipit form oxal scope document defin procedur determin calcium fertilis extract field applic method appli ec fertilis declar total water solubl calcium provid annex principl precipit calcium contain aliquot extract solut form oxal determin titrat potassium permangan reagent dilut hydrochlor acid volum hydrochlor acid ml volum water dilut sulphur acid volum sulphur acid ml ten volum water dilut ammonia solut volum ammonia ml volum water satur solut ammonia oxal nh ambient temperatur approxim gram litr citric acid solut ammonium chlorid solut solut bromothymol blue ethanol solut bromocresol green ethanol standard solut potassium permangan mol apparatu filter crucibl poros sinter glass hot water bath prepar aliquot analys pipett aliquot portion extract solut obtain method milligram ca milligram cao volum aliquot pour millilitr beaker neutralis turn indic green blue drop ammonia solut add millilitr citric acid solut millilitr ammonium chlorid solut precipit calcium oxal add approxim millilitr water bring boil add ten drop indic solut slowli millilitr hot ammonium oxal solut precipit form dissolv ad drop hydrochlor acid neutralis slowli ammonia solut stir continu ph turn indic green blue place beaker boil hot water bath approxim minut remov beaker bath leav stand hour filter crucibl titrat oxal precipit wash beaker crucibl excess ammonium oxal complet remov check absenc chlorid wash water place crucibl millilitr beaker dissolv precipit millilitr hot sulphur acid add water beaker order obtain volum approxim millilitr bring temperatur titrat drop drop permangan solut pink colour last minut volum express result calcium ca content fertilis gt refer graphic gt number millilitr permangan mass test sampl gram aliquot volum millilitr volum extract solut millilitr concentr permangan solut mole litr cao ca method determin magnesium atom absorpt spectrometri scope document defin procedur determin magnesium fertilis extract field applic method appli ec fertilis extract obtain method declar total magnesium water solubl magnesium requir except fertilis list annex relat secondari nutrient type kieserit type magnesium sulphat type magnesium sulphat solut except fertilis list annex relat potass fertilis type kieserit potassium sulphat method appli method set appli fertilis extract element quantiti interfer complexometr determin magnesium principl determin magnesium atom absorpt spectrometri dilut extract reagent hydrochlor acid mol solut hydrochlor acid mol solut standard solut magnesium milligram millilitr dissolv gram magnesium sulphat mgso mol hydrochlor acid solut weigh gram magnesium oxid mgo previous calcin remov trace carbon place beaker millilitr water millilitr mol hydrochlor acid dissolv decant quantit millilitr graduat flask make volum ad mix commerci standard solut laboratori respons test solut strontium chlorid solut dissolv gram strontium chlorid srcl hydrochlor acid solut make millilitr acid solut apparatu spectromet fit atom absorpt magnesium lamp set nm air acetylen flame prepar sampl method procedur fertilis declar magnesium mg content mgo millilitr extract solut transfer millilitr graduat flask make volum water mix dilut factor pipett millilitr extract solut solut transfer millilitr graduat flask make volum mol hydrochlor acid solut mix dilut factor dilut solut mol hydrochlor acid solut obtain concentr optimum work field spectromet volum sampl millilitr dilut factor final solut strontium chlorid solut prepar blank solut prepar blank solut repeat procedur extract method omit test sampl fertilis prepar calibr solut dilut standard solut mol hydrochlor acid prepar calibr solut increas concentr optimum measur rang apparatu solut strontium chlorid solut measur set spectromet wavelength nm sprai success calibr solut sampl solut blank solut wash instrument solut measur repeat oper time plot calibr curv absorb calibr ordin concentr magnesium µg ml abscissa determin concentr magnesium sampl xs blank xb refer calibr curv express result calcul amount magnesium mg magnesium oxid mgo sampl refer calibr solut take consider blank percentag magnesium mg fertilis equal gt refer graphic gt xs concentr solut analys record calibr curv µg ml xb concentr blank solut record calibr curv µg ml dilut factor solut dilut equal millilitr equal solut dilut dilut factor mass test sampl time extract mgo mg method determin magnesium complexometri scope document defin procedur determin magnesium fertilis extract field applic method appli ec fertilis extract determin total magnesium water solubl magnesium provid fertilis list annex straight nitrogen fertilis type calcium magnesium nitrat type magnesium sulphonitr type nitrogen fertilis magnesium straight potass fertilis type enrich kainit type potassium chlorid magnesium type potassium sulphat magnesium salt fertilis list annex relat secondari nutrient principl magnesium solubilis method titrat edta ca mg presenc eriochrom black titrat edta ca presenc calcein calcon carbon acid determin magnesium differ reagent standard mol solut magnesium dissolv gram magnesium sulphat mgso mol hydrochlor acid solut make millilitr acid weigh gram magnesium oxid previous calcin remov trace carbon place beaker millilitr water stir approxim millilitr approxim mol hydrochlor acid dissolut transfer quantit graduat millilitr flask make volum mix millilitr solut milligram mg milligram mgo laboratori respons test strength standard solut molar solut edta weigh gram dihydr disodium salt ethylenediaminetetraacet na place millilitr beaker dissolv millilitr water transfer solut quantit graduat millilitr flask make volum mix check solut standard solut take sampl millilitr titrat analyt procedur millilitr edta solut correspond milligram mg milligram mgo milligram ca milligram cao remark molar standard solut calcium weigh gram dry calcium carbon place beaker millilitr water progress stir millilitr approxim mol hydrochlor acid bring boil order drive carbon dioxid cool transfer quantit graduat litr flask make volum water mix check solut edta solut analyt procedur millilitr solut milligram ca milligram cao correspond millilitr molar edta solut calcein indic carefulli mix mortar gram calcein gram sodium chlorid milligram mixtur indic green orang titrat carri orang obtain free green ting calcon carbon acid indic dissolv milligram calcon carbon acid millilitr methanol solut approxim week drop solut indic red blue titrat carri blue obtain free red ting eriochrom black indic dissolv milligram eriochrom black mixtur millilitr propanol millilitr triethanolamin solut approxim week drop solut indic turn red blue titrat carri blue obtain free red ting colour magnesium present add millilitr standard solut calcium magnesium present edta form complex calcium magnesium case element determin concurr potassium cyanid solut aqueou solut kcn pipett mouth solut potassium hydroxid potassium cyanid dissolv gram koh gram kcn water make volum litr mix ph buffer solut millilitr graduat flask dissolv gram ammonium chlorid millilitr water add millilitr ammonia ml make volum water mix test ph solut regularli dilut hydrochlor acid volum hydrochlor acid ml volum water hydrochlor acid solut approxim mol hydrochlor acid solut approxim mol sodium hydroxid solut mol apparatu magnet mechan stirrer ph meter control test carri determin aliquot part solut ca mg ratio approxim equal solut analys end millilitr mg standard solut millilitr standard solut number millilitr edta solut titrat perform solut analys procedur correct solut edta calcium magnesium equival case make correct prepar solut analys method determin aliquot sampl aliquot part milligram magnesium milligram mgo titrat presenc eriochrom black pipett aliquot part solut analys millilitr beaker neutralis surplu acid mol sodium hydroxid solut ph meter dilut water approxim millilitr add millilitr buffer solut ph measur meter add millilitr potassium cyanid solut drop eriochrom black indic titrat edta solut stir gentli stirrer quot quot number millilitr mol edta solut titrat presenc calcein calcon carbon acid pipett aliquot part solut analys equal titrat place millilitr beaker neutralis surplu acid mol sodium hydroxid solut ph meter dilut water millilitr add millilitr koh kcn solut indic stir gentli stirrer titrat edta solut quot quot number millilitr mol edta solut express result ec fertilis method applic gram fertilis millilitr extract percentag content fertilis gt refer graphic gt gt refer graphic gt number millilitr mol edta solut titrat presenc calcein calcon carbon acid number millilitr mol edta solut titrat presenc eriochrom black mass sampl present aliquot part gram mol edta solut mol edta solut remark stoichiometr edta metal ratio complexometr analys valenc metal spite fact edta quadrival edta titrat solut standard solut molar normal complexometr indic sensit air solut lose colour titrat case drop indic ad true case eriochrom black calcon carbon acid metal indic complex stabl time colour chang drop edta ad slowli drop mol solut magnesium calcium ad ensur colour chang place true case eriochrom magnesium complex turn indic observ vertic horizont solut beaker white background lit posit turn indic observ easili place beaker frost glass lit moder watt lamp analysi requir amount experi task involv inter alia observ colour standard solut recommend determin carri laboratori chemist edta solut guarante strength titrisol normex simplifi control equival standard solut solut potassium cyanid pour sink cyanid convert harmless compound oxid sodium hypochlorit alkalis method determin sulphat scope document defin procedur determin sulphur present fertilis extract form sulphat field applic method appli determin sulphat present extract perform method principl gravimetr determin barium sulphat reagent dilut hydrochlor acid volum hydrochlor acid ml volum water barium chlorid solut bacl gram litr silver nitrat solut gram litr apparatu porcelain crucibl hot water bath dry oven set electr oven set procedur sampl solut pipett aliquot part extract solut milligram milligram place aliquot beaker suitabl capac add millilitr dilut hydrochlor acid make millilitr water prepar precipit bring solut boil add drop drop millilitr barium chlorid solut stir solut vigor boil minut place beaker cover watch glass boil hot water bath hour leav stand hot supernat liquor clear decant clear solut slow filtrat ash free filter wash precipit time hot water continu wash precipit filter filtrat chlorid free check silver nitrat solut inciner weigh precipit place filter paper precipit porcelain crucibl previous weigh nearest milligram dry oven ash approxim half hour cool desicc weigh milligram express result milligram barium sulphat correspond milligram milligram percentag content fertilis gt refer graphic gt gt refer graphic gt mass barium sulphat precipit milligram volum extract solut millilitr aliquot volum millilitr mass test sampl gram method determin sodium extract scope document defin procedur determin sodium fertilis extract field applic method appli ec fertilis declar sodium provid annex principl suitabl dilut extract obtain method sodium content solut determin flame emiss spectrometri reagent dilut hydrochlor acid volum hydrochlor acid analysi ml volum water aluminium nitrat al caesium chlorid cscl anhydr sodium chlorid nacl caesium chlorid aluminium nitrat solut dissolv water gram caesium chlorid gram aluminium nitrat millilitr graduat flask make volum water mix standard sodium solut milligram millilitr na dissolv water gram sodium chlorid millilitr graduat flask add millilitr hydrochlor acid make volum water mix apparatu spectromet equip flame emiss set nm calibr solut place millilitr standard solut millilitr graduat flask make volum mix concentr solut µg ml na place millilitr intermedi solut millilitr graduat flask add millilitr solut make volum mix concentr solut µg ml na prepar solut measur depend expect sodium content extract solut method gram fertilis millilitr carri dilut accord tabl gt tabl gt make intermedi dilut water final dilut add ten millilitr solut millilitr graduat flask test sampl gram multipli volum final dilut determin prepar spectromet measur nm calibr instrument measur respons calibr solut adjust sensit instrument entir scale concentr calibr solut measur respons sampl solut analys repeat oper time calcul result draw calibr curv plot averag respons calibr solut ordin concentr express µg millilitr abscissa determin sodium concentr test solut calcul quantiti sodium standard solut take account level dilut express result percentag sampl percentag sodium na content fertilis gt refer graphic gt gt refer graphic gt concentr solut introduc spectromet µg ml volum extract solut millilitr aliquot volum intermedi dilut millilitr volum intermedi dilut millilitr aliquot volum ml final dilut millilitr mass test sampl gram method micro nutrient concentr equal method extract total micro nutrient scope method defin procedur extract micro nutrient total boron total cobalt total copper total iron total manganes total molybdenum total zinc aim carri minimum number extract make extract determin total level micro nutrient list field applic procedur concern ec fertilis cover annex micro nutrient boron cobalt copper iron manganes molybdenum zinc applic micro nutrient declar content equal principl dissolut boil dilut hydrochlor acid note extract empir quantit depend product constitu fertilis case manganes oxid quantiti extract substanti smaller total quantiti manganes product respons fertilis manufactur ensur declar content correspond quantiti extract condit pertain method reagent dilut hydrochlor acid hcl solut mol mix volum hydrochlor acid ml volum water concentr ammonia solut nh ml apparatu electr hotplat variabl temperatur control note boron content extract determin borosil glasswar method involv boil teflon silica prefer rins glasswar wash deterg borat prepar sampl method procedur test sampl quantiti fertilis weigh depend declar content element product tabl obtain final solut dilut measur rang method sampl weigh mg gt tabl gt place sampl ml beaker prepar solut moisten sampl water add ml dilut hydrochlor acid gram fertilis carefulli small amount add ml water cover beaker watch glass mix bring boil hotplat boil minut cool stir occasion transfer quantit ml volumetr flask tabl make volum water mix filter dry filter dry contain discard portion extract perfectli clear recommend determin carri delai aliquot portion clear filtrat contain stopper remark extract boron content determin adjust ph concentr ammonia determin determin micro nutrient carri aliquot portion method individu micro nutrient remov organ chelat complex substanc aliquot portion extract method case determin atom absorpt spectrometri remov method extract water solubl micro nutrient scope method defin procedur extract water solubl form micro nutrient boron cobalt copper iron manganes molybdenum zinc aim carri minimum number extract make extract determin level micro nutrient list field applic procedur concern ec fertilis cover annex micro nutrient boron cobalt copper iron manganes molybdenum zinc applic micro nutrient declar content equal principl micro nutrient extract shake fertilis water note extract empir quantit reagent dilut hydrochlor acid hcl solut mol mix volum hydrochlor acid ml volum water apparatu rotari shaker set rpm ph meter note boron content extract determin borosil glasswar teflon silica prefer extract rins glasswar wash deterg borat prepar sampl method procedur test sampl quantiti fertilis weigh depend declar content element product tabl obtain final solut dilut measur rang method sampl weigh mg gt tabl gt place sampl ml flask tabl prepar solut add ml water ml flask ml water ml flask stopper flask shake vigor hand dispers sampl place flask shaker shake minut make volum water mix prepar test solut filter immedi clean dry flask stopper flask carri determin immedi filter note filtrat gradual cloudi make extract flask volum ve filter calibr flask volum previous dri receiv ml dilut hydrochlor acid stop filtrat exact moment calibr mark reach mix condit express result gt refer graphic gt dilut express result depend determin determin micro nutrient carri aliquot portion method individu micro nutrient remov organ chelat complex substanc aliquot portion method case determin atom absorpt spectrometri remov method remov organ compound fertilis extract scope method defin procedur remov organ compound fertilis extract field applic procedur applic analys sampl fertilis extract method declar total water solubl element requir annex regul note presenc small quantiti organ matter affect determin mean atom absorpt spectrometri principl organ compound aliquot portion extract oxidis hydrogen peroxid reagent dilut hydrochlor acid hcl solut mol mix volum hydrochlor acid ml volum water hydrogen peroxid solut ml free micro nutrient apparatu electr hotplat variabl temperatur control procedur ml extract solut obtain method method place ml beaker case method add ml dilut hydrochlor acid solut add ml hydrogen peroxid solut cover watch glass oxid occur room temperatur hour bring gradual boil boil half hour add ml hydrogen peroxid solut cool boil remov excess hydrogen peroxid cool transfer quantit ml volumetr flask make volum filter account dilut take aliquot portion calcul percentag micro nutrient product method determin micro nutrient fertilis extract atom absorpt spectrometri gener procedur scope document defin gener procedur determin level micro nutrient fertilis extract atom absorpt spectrometri field applic procedur applic analys sampl fertilis extract method declar total water solubl element requir annex regul adapt procedur micro nutrient detail method defin specif element note case presenc small quantiti organ matter affect determin atom absorpt spectrometri principl extract treat reduc elimin interf chemic speci extract dilut concentr optimum rang spectromet wave length suitabl micro nutrient determin reagent dilut hydrochlor acid solut hcl mol mix volum hydrochlor acid ml volum water dilut hydrochlor acid solut hcl mol mix volum hydrochlor acid ml volum water lanthanum salt solut la litr reagent determin cobalt iron manganes zinc prepar lanthanum oxid dissolv hydrochlor acid place lanthanum oxid la ml water litr volumetr flask add ml mol hydrochlor acid dissolv make litr water mix solut approxim mol hydrochlor acid solut lanthanum chlorid sulphat nitrat dissolv lanthanum chlorid heptahydr lacl lanthanum nitrat hexahydr la lanthanum sulphat nonahydr la ml water add ml mol hydrochlor acid dissolv make litr water mix solut approxim mol hydrochlor acid calibr solut prepar individu determin method micro nutrient apparatu atom absorpt spectromet fit sourc emit radiat characterist micro nutrient determin analyst follow manufactur instruct familiar apparatu apparatu background correct zn gase air acetylen prepar solut analys prepar extract solut micro nutrient determin method treatment test solut dilut aliquot portion extract obtain method water hydrochlor acid obtain final solut measur concentr element determin calibr rang hydrochlor acid concentr mol mol oper requir success dilut aliquot portion final solut obtain dilut extract volum ml pour ml volumetr flask determin cobalt iron manganes zinc content add ml lanthanum salt solut make volum mol hydrochlor acid solut mix final solut measur dilut factor procedur prepar blank solut prepar blank solut repeat procedur extract stage omit test sampl fertilis prepar calibr solut work calibr solut prepar method individu micro nutrient prepar ml volumetr flask seri calibr solut increas concentr optimum measur rang spectromet adjust concentr hydrochlor acid bring close dilut test solut determin cobalt iron manganes zinc add ml lanthanum salt solut make volum mol hydrochlor acid solut mix determin prepar spectromet determin adjust wavelength method individu micro nutrient concern sprai time success calibr solut test solut blank solut note result flush instrument distil water individu sprai construct calibr curv plot averag spectromet read calibr solut ordin concentr element express µg ml abscissa curv determin concentr relev micro nutrient test solut xs blank solut xb express concentr µg ml express result percentag micro nutrient fertilis equal gt refer graphic gt method gt refer graphic gt amount micro nutrient determin express percentag fertilis xs concentr test solut µg ml xb concentr blank solut µg ml volum extract obtain method ml factor dilut carri mass test sampl accord method gram calcul dilut factor ai aliquot portion vi volum ml respect dilut dilut factor equal gt refer graphic gt method determin boron fertilis extract mean spectrometri azomethin scope method describ procedur determin boron fertilis extract field applic procedur applic analys sampl fertilis extract method declar total water solubl boron requir annex regul principl azomethin solut borat ion form yellow complex concentr determin molecular absorpt spectrometri nm interf ion mask edta reagent edta buffer solut place ml volumetr flask ml water ammonium acet nh oocch disodium salt ethylen diamin tetraacet acid na edta ml acet acid ch cooh ml make volum water mix ph solut check mean glass electrod azomethin solut place ml volumetr flask ml buffer solut mg azomethin nnao absorb acid make volum mix prepar larg quantiti reagent stabl dai boron calibr solut boron stock solut µg ml dissolv boric acid bo water ml volumetr flask make volum water mix transfer plastic bottl storag refriger boron work solut µg ml place ml stock solut ml volumetr flask make volum water mix apparatu spectromet fit molecular absorpt cell mm optic path set wavelength nm prepar solut analys prepar boron solut method prepar test solut dilut aliquot portion extract obtain boron concentr success dilut dilut factor prepar correct solut test solut colour prepar correct solut place plastic flask ml test solut ml edta buffer solut ml water mix procedur prepar blank solut prepar blank solut repeat procedur extract stage omit test sampl fertilis prepar calibr solut transfer ml work calibr solut seri ml volumetr flask make ml water mix solut µg ml boron colour develop transfer ml calibr solut test solut blank seri plastic flask add ml edta buffer solut add ml azomethin solut mix colour develop dark hour determin measur absorb solut obtain correct solut water wavelength nm rins cell water read express result plot calibr curv concentr calibr solut abscissa absorb spectromet ordin read calibr curv concentr boron blank concentr boron test solut test solut colour correct concentr test solut calcul subtract absorb correct solut absorb test solut determin correct concentr test solut note concentr test solut correct xs blank xb percentag boron fertilis gt refer graphic gt method gt refer graphic gt quantiti boron express percentag fertilis xs concentr µg ml test solut correct xb concentr µg ml blank volum ml extract obtain accord method factor dilut carri mass gram test sampl accord method calcul dilut factor success aliquot portion volum respect dilut dilut factor gt refer graphic gt method determin cobalt fertilis extract atom absorpt spectrometri scope method describ procedur determin cobalt fertilis extract field applic procedur applic analys sampl fertilis extract method declar total water solubl cobalt requir annex regul principl suitabl treatment dilut extract cobalt content determin atom absorpt spectrometri reagent hydrochlor acid solut mol method hydrochlor acid solut mol method lanthanum salt solut la litr method cobalt calibr solut cobalt stock solut µg ml ml beaker weigh nearest mg cobalt add ml mol hydrochlor acid heat hotplat cobalt complet dissolv cool transfer quantit ml volumetr flask make volum water mix cobalt work solut µg ml place ml stock solut ml volumetr flask make volum mol hydrochlor acid solut mix apparatu atom absorpt spectromet method instrument equip sourc rai characterist cobalt nm spectromet background correct made prepar solut analys cobalt extract solut method prepar test solut method test solut lanthanum salt solut procedur prepar blank solut method blank lanthanum salt solut prepar calibr solut method optimum determin rang µg ml cobalt place ml work solut seri ml volumetr flask adjust hydrochlor acid concentr close test solut add flask ml lanthanum salt solut make ml mol hydrochlor acid solut mix solut µg ml cobalt determin method prepar spectromet measur wavelength nm express result method percentag cobalt fertilis gt refer graphic gt method gt refer graphic gt quantiti cobalt express percentag fertilis xs concentr µg ml test solut xb concentr µg ml blank solut volum ml extract obtain accord method factor dilut carri mass gram test sampl accord method calcul dilut factor ai aliquot portion vi volum ml respect dilut dilut factor gt refer graphic gt method determin copper fertilis extract atom absorpt spectrometri scope method describ procedur determin copper fertilis extract field applic procedur applic analys sampl fertilis extract method declar total water solubl copper requir annex regul principl suitabl treatment dilut extract copper content determin atom absorpt spectrometri reagent hydrochlor acid solut mol method hydrochlor acid solut mol method hydrogen peroxid solut ml free micro nutrient copper calibr solut copper stock solut µg ml ml beaker weigh nearest mg copper add ml mol hydrochlor acid add ml hydrogen peroxid solut heat hotplat copper complet dissolv transfer quantit ml volumetr flask make volum water mix copper work solut µg ml place ml stock solut ml volumetr flask make volum mol hydrochlor acid solut mix apparatu spectromet equip atom absorpt method instrument fit sourc rai characterist copper nm prepar solut analys copper extract solut method prepar test solut method procedur prepar blank solut method prepar calibr solut method optimum determin rang µg ml copper place ml work solut seri ml volumetr flask adjust hydrochlor acid concentr close test solut make ml mol hydrochlor acid solut mix solut µg ml copper determin method prepar spectromet measur wavelength nm express result method percentag copper fertilis gt refer graphic gt method gt refer graphic gt cu quantiti copper express percentag fertilis xs concentr µg ml test solut xb concentr µg ml blank solut volum ml extract obtain accord method factor dilut carri mass gram test sampl accord method calcul dilut factor ai aliquot portion vi volum ml respect dilut dilut factor gt refer graphic gt method determin iron fertilis extract atom absorpt spectrometri scope method describ procedur determin iron fertilis extract field applic procedur applic analys sampl fertilis extract method declar total water solubl iron requir annex regul principl suitabl treatment dilut extract iron content determin atom absorpt spectrometri reagent hydrochlor acid solut mol method hydrochlor acid solut mol method hydrogen peroxid solut ml free micro nutrient lanthanum salt solut la litr method iron calibr solut iron stock solut µg ml ml beaker weigh nearest mg iron wire add ml mol hydrochlor acid ml hydrogen peroxid solut heat hotplat iron complet dissolv cool transfer quantit ml volumetr flask make volum water mix iron work solut µg ml place ml stock solut ml volumetr flask make volum mol hydrochlor acid solut mix apparatu atom absorpt spectromet method instrument fit sourc rai characterist iron nm prepar solut analys iron extract solut method prepar test solut method test solut lanthanum salt solut procedur prepar blank solut method test solut lanthanum salt solut prepar calibr solut method optimum determin rang µg ml iron place ml work solut seri ml volumetr flask adjust hydrochlor acid concentr close test solut add ml lanthanum salt solut make volum mol hydrochlor acid solut mix solut µg ml iron determin method prepar spectromet measur wavelength nm express result method percentag iron fertilis gt refer graphic gt method gt refer graphic gt fe quantiti iron express percentag fertilis xs concentr µg ml test solut xb concentr µg ml blank solut volum ml extract obtain accord method factor dilut carri mass gram test sampl accord method calcul dilut factor ai aliquot portion vi volum ml respect dilut dilut factor gt refer graphic gt method determin manganes fertilis extract atom absorpt spectrometri scope method describ procedur determin manganes fertilis extract field applic procedur applic analys sampl fertilis extract method declar total water solubl manganes requir annex regul principl suitabl treatment dilut extract manganes level determin atom absorpt spectrometri reagent hydrochlor acid solut mol method hydrochlor acid solut mol method lanthanum salt solut la litr method manganes calibr solut manganes stock solut µg ml ml beaker weigh nearest mg manganes add ml mol hydrochlor acid heat hotplat manganes complet dissolv cool transfer quantit ml volumetr flask make volum water mix manganes work solut µg ml dilut ml stock solut mol hydrochlor acid solut ml volumetr flask make volum mol hydrochlor acid solut mix apparatu atom absorpt spectromet method instrument fit sourc line characterist manganes nm prepar solut analys manganes extract solut method prepar test solut method test solut volum lanthanum salt solut procedur prepar blank solut method test solut volum lanthanum salt solut prepar calibr solut method optimum determin rang µg ml manganes place ml work solut seri ml volumetr flask adjust hydrochlor acid concentr bring close test solut flask add ml lanthanum salt solut make ml mol hydrochlor acid solut mix solut µg ml manganes determin method prepar spectromet measur wavelength nm express result method percentag manganes fertilis gt refer graphic gt method gt refer graphic gt mn quantiti manganes express percentag fertilis xs concentr µg ml test solut xb concentr µg ml blank solut volum ml extract obtain accord method factor dilut carri mass gram test sampl accord method calcul dilut factor ai aliquot portion vi volum ml respect dilut dilut factor equal gt refer graphic gt method determin molybdenum fertilis extract spectrometri complex ammonium thiocyan scope method describ procedur determin molybdenum fertilis extract field applic procedur applic analys sampl fertilis extract method declar total water solubl molybdenum requir annex regul principl molybdenum form complex moo scn acid medium scn ion complex extract butyl acet interf ion iron remain aqueou phase yellow orang colour determin molecular absorpt sectrometri nm reagent dilut hydrochlor acid solut hcl mol method copper solut mg mol hydrochlor acid dissolv mg copper sulphat cuso weigh mg ml mol hydrochlor acid solut ml volumetr flask make volum water mix ascorb acid solut dissolv ascorb acid water ml volumetr flask make volum water mix refriger butyl acet ammonium thiocyan solut mol dissolv nh scn water ml volumetr flask make volum water mix store dark colour bottl stannou chlorid solut mol hydrochlor acid solut perfectli clear prepar immedi pure stannou chlorid solut clear prepar ml solut dissolv sncl ml mol hcl solut add ml copper solut make volum water mix molybdenum calibr solut molybdenum stock solut µg ml dissolv ammonium molybd nh mo weigh mg mol hydrochlor acid ml volumetr flask make volum solut mix molybdenum intermedi solut µg ml place ml stock solut ml volumetr flask make volum mol hydrochlor acid mix molybdenum work solut µg ml place ml intermedi solut ml volumetr flask make volum mol hydrochlor acid mix apparatu spectromet fit molecular absorpt cuvett mm optic path set wavelength nm ml separ funnel prepar solut analys molybdenum extract solut method prepar test solut dilut aliquot portion extract mol hydrochlor acid solut obtain molybdenum concentr dilut factor aliquot portion extract solut µg molybdenum place separ funnel make ml mol hydrochlor acid solut procedur prepar blank solut prepar blank solut repeat procedur extract stage omit test sampl fertilis prepar seri calibr solut prepar seri calibr solut increas concentr optimum respons rang spectromet interv µg molybdenum place ml work solut separ funnel make ml mol hydrochlor acid funnel µg molybdenum develop separ complex separ funnel add order ml copper solut ml ascorb acid solut mix wait minut add ml butyl acet precis pipett ml thiocyan solut shake minut extract complex organ phase precipit separ phase draw entir aqueou phase discard wash organ phase ml stannou chlorid solut shake minut precipit draw entir aqueou phase collect organ phase test tube make collect drop water suspens determin measur absorb solut obtain wavelength nm µg ml molybdenum calibr solut refer express result construct calibr curv plot mass molybdenum calibr solut express µg abscissa valu absorb spectromet read ordin curv determin mass molybdenum test solut blank solut mass design xs xb percentag molybdenum fertilis gt refer graphic gt method gt refer graphic gt mo quantiti molybdenum express percentag fertilis volum ml aliquot dilut solut xs mo mass µg test solut xb mo mass µg blank solut volum correspond volum aliquot test solut volum ml extract solut obtain accord method factor dilut perform mass gram test sampl accord method calcul dilut factor success aliquot portion volum respect dilut dilut factor gt refer graphic gt method determin zinc fertilis extract atom absorpt spectrometri scope method describ procedur determin zinc fertilis extract field applic procedur applic analys sampl fertilis extract method declar total water solubl zinc requir annex regul principl suitabl treatment dilut extract zinc level determin atom absorpt spectrometri reagent hydrochlor acid solut mol method hydrochlor acid solut mol method lanthanum salt solut la litr method zinc calibr solut zinc stock solut µg ml ml volumetr flask dissolv zinc powder flake weigh mg ml mol hydrochlor acid complet dissolv make volum water mix zinc work solut µg ml ml volumetr flask dilut ml stock solut mol hydrochlor acid solut make volum mol hydrochlor acid solut mix apparatu atom absorpt spectromet method instrument fit sourc line characterist zinc nm spectromet background correct made prepar solut analys zinc extract solut method prepar test solut method test solut volum lanthanum salt solut procedur prepar blank solut method test solut volum lanthanum salt solut prepar calibr solut method optimum interv µg ml zinc place ml work solut seri ml volumetr flask adjust hydrochlor acid concentr bring close test solut flask add ml lanthanum salt solut make ml mol hydrochlor acid solut mix solut µg ml zinc determin method prepar spectromet measur wavelength nm express result method percentag zinc fertilis gt refer graphic gt method gt refer graphic gt zn quantiti zinc express percentag fertilis xs concentr µg ml test solut xb concentr µg ml blank solut volum ml extract obtain accord method factor dilut carri mass gram test sampl accord method calcul dilut factor ai aliquot portion vi volum ml respect dilut dilut factor equal gt refer graphic gt method micro nutrient concentr greater method extract total micro nutrient scope method defin procedur extract micro nutrient total boron total cobalt total copper total iron total manganes total molybdenum total zinc aim carri minimum number extract make extract determin total level micro nutrient list field applic procedur concern commun fertilis cover annex regul micro nutrient boron cobalt copper iron manganes molybdenum zinc applic micro nutrient declar content principl dissolut boil dilut hydrochlor acid note extract empir quantit depend product constitu fertilis case manganes oxid quantiti extract substanti smaller total quantiti manganes product respons fertilis manufactur ensur declar content correspond quantiti extract condit pertain method reagent dilut hydrochlor acid hcl solut mol mix volum hydrochlor acid ml volum water concentr ammonia solut nh ml apparatu electr hotplat variabl temperatur control ph meter note boron content extract determin borosil glasswar method involv boil teflon silica prefer rins glasswar wash deterg borat prepar sampl method procedur test sampl quantiti fertilis weigh depend declar content element product tabl obtain final solut dilut measur rang method sampl weigh mg gt tabl gt place sampl ml beaker prepar solut moisten sampl water add ml dilut hydrochlor acid gram fertilis carefulli small amount add ml water cover beaker watch glass mix bring boil hotplat boil minut cool stir occasion transfer quantit ml volumetr flask make volum water mix filter dry filter dry contain discard portion extract perfectli clear recommend determin carri delai aliquot portion clear filtrat contain stopper note extract boron content determin adjust ph concentr ammonia determin determin micro nutrient carri aliquot portion method individu micro nutrient method determin element present chelat complex form case method prior determin case determin aa method treatment method extract water solubl micro nutrient scope method defin procedur extract water solubl form micro nutrient boron cobalt copper iron manganes molybdenum zinc aim carri minimum number extract make extract determin level micro nutrient list field applic procedur concern commun fertilis cover annex regul micro nutrient boron cobalt copper iron manganes molybdenum zinc applic micro nutrient declar content principl micro nutrient extract shake fertilis water note extract empir quantit reagent dilut hydrochlor acid hcl solut mol mix volum hydrochlor acid ml volum water apparatu rotari shaker set rpm note boron content extract determin borosil glasswar teflon silica prefer extract rins glasswar wash deterg borat prepar sampl method procedur test sampl quantiti fertilis weigh depend declar content product tabl obtain final solut dilut measur rang method sampl weigh mg gt tabl gt place sampl ml flask prepar solut add ml water stopper flask shake vigor hand dispers sampl place flask shaker shake minut make volum water mix prepar test solut filter immedi clean dry flask stopper flask carri determin immedi filter note filtrat gradual cloudi make extract flask volum ve filter calibr flask volum previous dri receiv ml dilut hydrochlor acid stop filtrat exact moment calibr mark reach mix condit express result gt refer graphic gt dilut express result depend determin determin micro nutrient carri aliquot portion method individu micro nutrient method determin element present chelat complex form case method prior determin case determin aa method treatment method remov organ compound fertilis extract scope method defin procedur remov organ compound fertilis extract field applic procedur applic analys sampl fertilis extract method declar total water solubl element requir annex regul note presenc small quantiti organ matter affect determin mean atom absorpt spectrometri principl organ compound aliquot portion extract oxidis hydrogen peroxid reagent dilut hydrochlor acid hcl solut mol mix volum hydrochlor acid ml volum water hydrogen peroxid solut ml free micro nutrient apparatu electr hotplat variabl temperatur control procedur ml extract solut obtain method method place ml beaker case method add ml dilut hydrochlor acid solut add ml hydrogen peroxid solut cover watch glass oxid occur room temperatur hour bring gradual boil boil half hour add ml hydrogen peroxid solut cool boil remov excess hydrogen peroxid cool transfer quantit ml volumetr flask make volum filter account dilut take aliquot portion calcul percentag micro nutrient product method determin micro nutrient fertilis extract atom absorpt spectrometri gener procedur scope document defin gener procedur determin level iron zinc fertilis extract atom absorpt spectrometri field applic procedur applic analys sampl fertilis extract method declar total water solubl iron zinc requir annex regul adapt procedur micro nutrient detail method defin specif element note case presenc small quantiti organ matter affect determin atom absorpt spectrometri principl extract treat reduc elimin interf chemic speci extract dilut concentr optimum rang spectromet wavelength suitabl micro nutrient determin reagent dilut hydrochlor acid solut hcl mol mix volum hydrochlor acid ml volum water dilut hydrochlor acid solut hcl mol mix volum hydrochlor acid ml volum water lanthanum salt solut la litr reagent determin iron zinc prepar lanthanum oxid dissolv hydrochlor acid place lanthanum oxid la ml water litr volumetr flask add ml mol hydrochlor acid dissolv make litr water mix solut approxim mol hydrochlor acid solut lanthanum chlorid sulphat nitrat dissolv lanthanum chlorid heptahydr lacl lanthanum nitrat hexahydr la lanthanum sulphat nonahydr la ml water add ml mol hydrochlor acid dissolv make litr water mix solut approxim mol hydrochlor acid calibr solut prepar individu determin method micro nutrient apparatu atom absorpt spectromet fit sourc emit radiat characterist micro nutrient determin analyst follow manufactur instruct familiar apparatu apparatu background correct zn gase air acetylen prepar solut analys prepar extract solut element determin method treatment test solut dilut aliquot portion extract obtain method water hydrochlor acid obtain final solut measur concentr element determin calibr rang hydrochlor acid concentr mol mol oper requir success dilut final solut obtain place aliquot portion dilut extract ml volumetr flask volum aliquot portion ml add ml lanthanum salt solut make volum mol hydrochlor acid solut mix dilut factor procedur prepar blank solut prepar blank solut repeat procedur extract stage omit test sampl fertilis prepar calibr solut work calibr solut prepar method individu micro nutrient prepar ml volumetr flask seri calibr solut increas concentr optimum measur rang spectromet adjust concentr hydrochlor acid bring close dilut test solut determin iron zinc add ml lanthanum salt solut make volum mol hydrochlor acid solut mix determin prepar spectromet determin adjust wavelength method individu micro nutrient concern sprai time success calibr solut test solut blank solut note result flush instrument distil water individu sprai construct calibr curv plot averag spectromet read calibr solut ordin concentr element express µg ml abscissa curv determin concentr relev micro nutrient test solut xs blank solut xb express concentr µg ml express result percentag micro nutrient fertilis gt refer graphic gt method gt refer graphic gt amount micro nutrient determin express percentag fertilis xs concentr test solut µg ml xb concentr blank solut µg ml volum extract obtain method ml factor dilut carri mass test sampl accord method gram calcul dilut factor ai aliquot portion vi volum ml respect dilut dilut factor equal gt refer graphic gt method determin boron fertilis extract mean acidimetr titrat scope method defin procedur determin boron content fertilis extract field applic procedur applic extract sampl fertilis obtain method method declar total water solubl boron requir annex regul principl mannitobor complex form reaction borat mannitol gt refer graphic gt complex titrat sodium hydroxid solut ph reagent methyl red indic solut dissolv methyl red ml ethanol ml volumetr flask make volum ml water mix dilut hydrochlor acid solut mol mix volum hydrochlor acid hcl ml volum water sodium hydroxid solut mol free carbon dioxid dissolv sodium hydroxid naoh pellet form litr volumetr flask ml boil water solut cool make ml boil water mix standard sodium hydroxid solut mol free carbon dioxid dilut mol sodium hydroxid solut time boil water mix solut express boron determin paragraph boron calibr solut µg ml dissolv boric acid bo weigh nearest mg water ml volumetr flask make volum water mix transfer plastic bottl storag refriger mannitol powder sodium chlorid nacl apparatu ph meter glass electrod magnet stirrer ml beaker teflon rod prepar solut analys prepar boron solut method procedur test place ml beaker aliquot extract mg add ml water add drop methyl red indic solut case extract method acidifi ad mol hydrochlor acid point chang indic solut add ml mol hydrochlor acid ad sodium chlorid bring boil drive carbon dioxid cool place beaker magnet stirrer insert precalibr ph meter electrod adjust ph mol sodium hydroxid solut mol solut add mannitol dissolv complet mix titrat mol sodium hydroxid solut ph minut stabil volum requir blank solut prepar blank solut repeat procedur prepar solut stage omit fertilis volum requir boron sodium hydroxid solut pipett ml mg calibr solut ml beaker add drop methyl red indic solut add sodium chlorid hydrochlor acid solut point chang indic solut make volum ml bring gradual boil elimin carbon dioxid cool place beaker magnet stirrer insert precalibr ph meter electrod adjust ph mol sodium hydroxid solut mol solut add mannitol dissolv complet mix titrat mol sodium hydroxid solut ph minut stabil volum requir prepar blank solut substitut ml water calibr solut volum requir boron mg ml standard naoh solut gt refer graphic gt ml mol sodium hydroxid solut correspond mg express result percentag boron fertilis gt refer graphic gt percentag boron fertilis volum ml mol sodium hydroxid solut need test solut volum ml mol sodium hydroxid solut need blank solut boron mg ml mol sodium hydroxid solut mol volum ml extract solut obtain accord method volum ml aliquot extract solut mass gram test sampl accord method method determin cobalt fertilis extract gravimetr method nitroso naphthol scope document defin procedur determin cobalt fertilis extract field applic procedur applic extract sampl fertilis obtain method method declar cobalt content requir annex regul principl cobalt iii combin nitroso naphthol give red precipit ono cobalt present extract brought cobalt iii state cobalt precipit acet acid medium solut nitroso naphthol filtrat precipit wash dri constant mass weigh ono reagent hydrogen peroxid solut ml sodium hydroxid solut mol dissolv sodium hydroxid pellet form ml water dilut hydrochlor acid solut mol mix volum hydrochlor acid ml volum water acet acid ch ml acet acid solut mol mix volum acet acid volum water solut nitroso naphthol ml acet acid add ml lukewarm water mix filter solut obtain immedi apparatu filter crucibl iso poros capac ml dry oven prepar solut analys prepar cobalt solut method prepar solut analys place aliquot extract mg ml beaker extract obtain method acidifi drop hydrochlor acid add ml hydrogen peroxid solut oxid act cold state minut make ml water cover beaker watch glass bring solut boil point boil minut cool make alkalin sodium hydroxid solut drop drop black cobalt hydroxid begin precipit procedur add ml acet acid make solut water ml heat boil burett add ml nitroso naphthol solut drop drop stir constantli complet vigor stir make precipit coagul filter previous weigh filter crucibl take care clog crucibl mind ensur liquid left precipit filtrat process wash beaker dilut acet acid remov precipit wash precipit filter dilut acet acid time hot water dry dry oven constant mass achiev express result mg ono precipit correspond mg percentag cobalt fertilis gt refer graphic gt mass mg precipit volum ml extract solut obtain accord method method volum ml aliquot dilut dilut factor aliquot mass test sampl method determin copper fertilis extract titrimetr method scope document defin procedur determin copper fertilis extract field applic procedur applic extract sampl fertilis obtain method method declar copper content requir annex regul principl cupric ion reduc acid medium potassium iodid gt refer graphic gt iodin releas titrat standard sodium thiosulph solut presenc starch indic accord gt refer graphic gt reagent nitric acid hno ml urea nh ammonium bifluorid nh hf solut solut plastic contain ammonium hydroxid solut mix volum ammonia nh ml volum water sodium thiosulph standard solut dissolv sodium thiosulph pentahydr na water litr volumetr flask solut prepar ml mg cu stabilis add drop chloroform solut glass contain protect direct light potassium iodid ki potassium thiocyan kscn solut solut plastic flask starch solut place starch ml beaker add ml water boil stir cool ambient temperatur solut short preserv period preserv extend ad mg mercuri iodid prepar solut analys prepar copper solut method procedur prepar solut titrat place aliquot portion solut mg cu ml erlenmey flask drive excess oxygen present boil briefli make volum ml water add ml nitric acid bring boil boil half minut remov erlenmey flask heat apparatu add urea resum boil half minut remov heat apparatu add ml cold water cool content erlenmey flask ambient temperatur gradual add ammonia hydroxid solut solut blue add ml excess add ml ammonium bifluorid solut mix add potassium iodid dissolv titrat solut place erlenmey flask magnet stirrer insert rod erlenmey flask adjust stirrer desir speed burett add standard sodium thiosulph solut brown colour iodin releas solut intens add ml starch solut continu titrat sodium thiosulph solut purpl colour disappear add ml potassium thiocyan solut continu titrat violet blue colour complet disappear note volum thiosulph solut emploi express result ml standard sodium thiosulph solut correspond mg cu percentag copper fertilis gt refer graphic gt volum ml sodium thiosulph solut volum ml extract solut accord method volum ml aliquot portion mass test sampl treat accord method method determin iron fertilis extract atom absorpt spectrometri scope method describ procedur determin iron fertilis extract field applic procedur applic extract sampl fertilis obtain method declar total water solubl iron requir annex regul principl suitabl treatment dilut extract iron content determin atom absorpt spectrometri reagent hydrochlor acid solut mol method hydrochlor acid solut mol method hydrogen peroxid solut ml free micro nutrient lanthanum salt solut la litr method iron calibr solut iron stock solut µg ml ml beaker weigh nearest mg pure iron wire add ml mol hydrochlor acid ml hydrogen peroxid solut heat hotplat iron complet dissolv cool transfer quantit ml volumetr flask make volum water mix iron work solut µg ml place ml stock solut ml volumetr flask make volum mol hydrochlor acid solut mix apparatu atom absorpt spectromet method instrument fit sourc emit radiat characterist iron nm prepar solut analys iron extract solut method prepar test solut method test solut lanthanum salt solut procedur prepar blank solut method blank solut lanthanum salt solut prepar calibr solut method optimum determin rang µg ml iron place ml work solut seri ml volumetr flask adjust hydrochlor acid concentr close test solut add ml lanthanum salt solut make volum mol hydrochlor acid solut mix solut µg ml iron determin method prepar spectromet measur wavelength nm express result method percentag iron fertilis gt refer graphic gt method gt refer graphic gt fe quantiti iron express percentag fertilis xs concentr µg ml test solut xb concentr µg ml blank solut volum ml extract obtain accord method factor dilut carri mass gram test sampl accord method calcul dilut factor ai aliquot portion vi volum ml respect dilut dilut factor gt refer graphic gt method determin manganes fertilis extract titrat scope method describ procedur determin manganes fertilis extract field applic procedur applic extract sampl fertilis obtain method declar manganes requir annex principl chlorid ion present extract driven boil extract sulphur acid manganes oxidis sodium bismuth nitric acid medium permangan form reduc excess ferrou sulphat excess titrat potassium permangan solut reagent concentr sulphur acid ml sulphur acid mol carefulli mix volum concentr sulphur acid volum water nitric acid mol mix volum nitric acid hno ml volum water nitric acid mol mix volum mol nitric acid volum water sodium bismuth nabio kieselguhr orthophosphor acid mol po ml ferrou sulphat solut mol dissolv ferrou sulphat heptahydr feso litr volumetr flask add ml concentr sulphur acid ml phosphor acid make ml mix potassium permangan solut mol weigh potassium permangan kmno mg dissolv make ml water silver nitrat solut mol dissolv silver nitrat agno water make ml apparatu filter crucibl iso poros capac ml mount ml filtrat flask magnet stirrer prepar solut analys manganes extract solut method chlorid ion present perform test solut drop silver nitrat solut absenc chlorid ion place aliquot extract mg manganes tall form ml beaker bring volum ml evapor ad water add ml concentr sulphur acid chlorid ion present remov place aliquot extract mg manganes tall form ml beaker add ml mol sulphur acid fume hood bring boil hotplat boil copiou white fume releas continu volum reduc ml thin film syrupi liquid bottom beaker cool ambient temperatur carefulli add ml water test presenc chlorid drop silver nitrat solut chlorid remain repeat oper ad ml mol sulphur acid procedur add ml mol nitric acid sodium bismuth ml beaker test solut stir vigor minut magnet stirrer add ml mol nitric acid stir filter vacuo crucibl bottom cover kieselguhr wash crucibl time mol nitric acid colourless filtrat obtain transfer filtrat wash solut ml beaker mix add ml mol ferrou sulphat solut filtrat turn yellow addit ferrou sulphat add ml mol orthophosphor acid burett titrat excess ferrou sulphat mol potassium permangan solut mixtur turn pink colour remain stabl minut perform blank test condit omit test sampl note oxidis solut contact rubber express result ml mol potassium permangan solut correspond mg manganes mn percentag manganes fertilis gt refer graphic gt xb volum ml permangan blank xs volum ml permangan test sampl volum ml extract solut accord method volum ml aliquot portion extract mass test sampl method determin molybdenum fertilis extract gravimetr method hydroxyquinolin scope document describ procedur determin molybdenum fertilis extract field applic procedur applic extract sampl fertilis obtain method declar molybdenum requir annex regul principl molybdenum level determin precipit molybdenyl oxin specif condit reagent sulphur acid solut approxim mol carefulli pour ml sulphur acid ml litr volumetr flask ml water mix cool make litr mix dilut ammonia solut mix volum concentr ammonia solut nh ml volum water dilut acet acid solut mix volum concentr acet acid ch cooh ml volum water solut disodium salt ethylen diamin tetraacet acid edta dissolv na edta water ml volumetr flask make calibr mark mix buffer solut ml volumetr flask dissolv ml concentr acet acid ammonium acet water make ml hydroxyquinolin oxin solut ml volumetr flask dissolv hydroxyquinolin ml concentr acet acid add ml water add ammonia solut drop drop solut cloudi add acet acid solut clear make ml water apparatu filter crucibl iso poros capac ml ph meter glass electrod dry oven prepar solut analys prepar molybdenum solut method method procedur prepar test solut place aliquot portion mg mo ml beaker make volum ml water adjust solut ph ad sulfur acid solut drop drop add ml edta solut ml buffer solut make ml water obtain wash precipit obtain precipit heat solut slightli stir constantli add oxin solut continu precipit format deposit longer observ add reagent supernat solut turn slightli yellow quantiti ml suffici continu heat precipit slightli minut filtrat wash filter filter crucibl rins time ml hot water rins water gradual colourless indic oxin longer present weigh precipit dry precipit constant mass hour cool desicc weigh express result mg molybdenyl oxin moo correspond mg mo percentag molybdenum fertilis gt refer graphic gt mass mg molybdenyl oxin precipit volum ml extract solut accord method volum ml aliquot dilut dilut factor aliquot mass test sampl method determin zinc fertilis extract atom absorpt spectrometri scope method describ procedur determin zinc fertilis extract field applic procedur applic extract sampl fertilis obtain method declar zinc requir annex regul principl suitabl treatment dilut extract zinc level determin atom absorpt spectrometri reagent hydrochlor acid solut mol method hydrochlor acid solut mol method lanthanum salt solut la litr method zinc calibr solut zinc stock solut µg ml ml volumetr flask dissolv zinc powder flake weigh mg ml mol hydrochlor acid complet dissolv make volum water mix zinc work solut µg ml ml volumetr flask dilut ml stock solut mol hydrochlor acid solut make volum mol hydrochlor acid solut mix apparatu atom absorpt spectromet method apparatu fit sourc line characterist zinc nm spectromet background correct made prepar solut analys zinc extract solut method prepar test solut method test solut volum lanthanum salt solut procedur prepar blank solut method blank solut volum lanthanum salt solut prepar calibr solut method optimum interv µg ml zinc place ml work solut seri ml volumetr flask adjust concentr hydrochlor acid bring close test solut add ml lanthanum salt solut volumetr flask make ml mol hydrochlor acid solut mix solut µg ml zinc determin method prepar spectromet measur wavelength nm express result method percentag zinc fertilis gt refer graphic gt method gt refer graphic gt zn quantiti zinc express percentag fertilis xs concentr µg ml test solut xb concentr µg ml blank solut volum ml extract solut obtain accord method factor dilut perform mass test sampl accord method calcul dilut factor ai success aliquot portion vi volum ml respect dilut dilut factor gt refer graphic gt number obtain fraction round number packag content exce kg increment sampl content origin packag packag content exce kg increment sampl content origin packag packag content exce kg increment sampl content origin packag number obtain fraction round number packag content exce kg increment sampl content origin packag packag content exce kg increment sampl content origin packag lump broken separ return sampl quantiti ammoniac nitrogen contain aliquot part tabl approxim variant variant variant condens regul continu flow condens ensur distil complet minut biuret purifi wash ammoniac solut aceton dry vacuum point quot appendix quot mechan stirrer flask shaken hand minut phosphoru solubl miner acid water solubl phosphoru phosphoru solubl solut ammonium citrat phosphoru solubl citric acid phosphoru solubl formic acid ml solut precipit ml citrat solut neutral citrat petermann jouli alkalin citrat precipit phosphat solut ml citrat solut neutral petermann jouli acidifi ml concentr nitric acid footnot ml precipit reagent annex list document consult manufactur repres order compil technic file type fertilis ad annex regul guid compil technic file applic design fertilis quot ec fertilis quot offici journal european commun commiss direct eec march defin lai detail arrang system specif inform relat danger prepar implement articl direct eec offici journal european commun commiss direct ec decemb amend commiss direct eec defin lai detail arrang system specif inform relat danger prepar implement articl council direct eec offici journal european commun standard accredit laboratori compet provid servic check complianc ec fertilis requir regul annex standard applic level laboratori en iso iec gener requir compet test calibr laboratori standard applic level accredit bodi en calibr test laboratori accredit system gener requir oper recognit