Designation:D5176−08(Reapproved2015)StandardTestMethodforTotalChemicallyBoundNitrogeninWaterbyPyrolysisandChemiluminescenceDetection1ThisstandardisissuedunderthefixeddesignationD5176;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthetotalnitrogencontentofwaterinconcentrationsfrom0.5to1000mg/L.Highernitrogenconcentrationsmaybedeterminedbymakingtheproperdilutions.1.2Thistestmethoddoesnotdeterminemolecularnitrogen(N2).1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1129TerminologyRelatingtoWaterD1193SpecificationforReagentWaterD2777PracticeforDeterminationofPrecisionandBiasofApplicableTestMethodsofCommitteeD19onWater3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthisstandard,refertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1totalchemicallyboundnitrogen,n—allinorganicandorganicnitrogeninthesample,exceptmolecularnitrogen(N2).4.SummaryofTestMethod4.1Thesampleofwaterisintroducedintoastreamofoxygenorinert/oxygenmixflowingthroughaquartzpyrolysistube.Oxidativepyrolysisconvertschemicallyboundnitrogentonitricoxide(NO).ThegasstreamisdriedandtheNOiscontactedwithozone(O3)producingmetastablenitrogendioxide(NO2*).AstheNO2*decays,lightisemittedanddetectedbyaphotomultipliertube.Theresultingsignalisameasureofthetotalchemicallyboundnitrogeninthesample.5.SignificanceandUse5.1Thistestmethodisusefulforthedeterminationoftotalchemicallyboundnitrogeninwastewatersandot...
