{HEAD ~ An antimonate}, such as potassium antimonate, is used as {TAIL ~ the destruction catalyst} in nitrogen determinations according to the Kjeldahl principle 
is used as
{ HEAD ~ An antimonate } , such as potassium antimonate , is used as { TAIL ~ the destruction catalyst } in nitrogen determinations according to the Kjeldahl principle
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH