WEF Discussion Forums
Laboratory Management and Technical Issues
QC standard for TSS
with the new Methods update Rule from May 2012, EPA established 12 QC guildlines for all methods, if they are not specific in the method.
One such method is 2540D, Total Suspended Solids. I was curious what labs used for thier QC standard for this test. I make a standard using cellulose to equal 100 mg/L - a lot cheaper than buying commercially prepared standards.
We make up a 100 ppm solution of diatomaceous earth, purchased as a reagent from one of the big lab suppliers (VWR, Fisher,...).
City of Portland, OR