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总氮测定值小于氨氮值的原因分析.docx

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总氮测定值小于氨氮值的原因分析 Introduction: Totalnitrogenandammonianitrogenaretwoimportantparametersforwaterqualityanalysis.Totalnitrogenincludesallformsofnitrogen,includingorganicnitrogen,ammonianitrogen,nitratenitrogen,etc.Ammonianitrogenrefersspecificallytotheamountofnitrogenpresentasammoniaions(NH4+)inthewatersample.Insomecases,thetotalnitrogenvalueisfoundtobelowerthantheammonianitrogenvalue.Thisindicatesthattheremustbesomeotherformofnitrogenpresentinthewatersample.Thepurposeofthispaperistoanalyzethereasonsbehindthetotalnitrogenvaluebeinglowerthantheammonianitrogenvalue. Possiblereasons: 1.Nitratenitrogen: Onepossiblereasonforthetotalnitrogenvaluebeinglowerthantheammonianitrogenvalueisthepresenceofnitrates.Nitratesareacommonformofnitrogeninwatersamples,andtheyareoftenfoundinhigherconcentrationsthanammonianitrogen.Ifnitratesarepresentinthewatersample,theywillbeincludedinthetotalnitrogenvaluebutnottheammonianitrogenvalue.Therefore,thetotalnitrogenvaluewillbelowerthantheammonianitrogenvalue. 2.Organicnitrogen: Organicnitrogenisanotherpossiblereasonforthetotalnitrogenvaluebeinglowerthantheammonianitrogenvalue.Organicnitrogenispresentinthewaterintheformoforganiccompoundssuchasaminoacidsandproteins.Thesecompoundscontainnitrogenatoms,andwhentheyaredecomposedbymicroorganismsinthewater,theyreleaseammoniaandotherformsofnitrogen.Therefore,ifthereisasignificantamountoforganicnitrogeninthewatersample,theammonianitrogenvaluewillbehigherthanthetotalnitrogenvalue. 3.Dissolvednitrogengas: Nitrogengas(N2)isanotherformofnitrogenthatcanbepresentinwater.Undercertainconditions,dissolvednitrogengascanbereleasedfromthewaterandmeasuredasnitrogengasintheanalysis.Thisdissolvednitrogengasisnotincludedinthetotalnitrogenvalueortheammonianitrogenvalue,asitisnotintheformofanitrogencompound. 4.Experimentalerrors: Anotherpossiblereasonforthetotalnitrogenvaluebeinglowerthantheammonianitrogenvalueisexperimentalerrors.Errorsinsamplecollection,preparation,oranalysiscanleadtoinaccurateresults.Forexample,ifthesampl