Designation:D1608−98(Reapproved2009)StandardTestMethodforOxidesofNitrogeninGaseousCombustionProducts(Phenol-DisulfonicAcidProcedures)1ThisstandardisissuedunderthefixeddesignationD1608;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesthephenol-disulfonicacidcolorimetricprocedure(1)2forthedeterminationoftotaloxidesofnitrogen[nitrousoxide(N2O)excepted]ingaseouseffluentsfromcombustionandothernitrogenoxidationpro-cesses.1.2Itisapplicabletoaconcentrationrangeofoxidesofnitrogenasnitrogendioxide(NO2)of5ppmtoseveralthousandpartspermillionbyvolume(fourtoseveralthousandmilligramsperdrystandardcubicmetre).1.3Sincethegrabsamplingtechniqueusedtakesarela-tivelysmallsampleoveraveryshortperiodoftime,theresultobtainedwillbeaninstantaneousmeasureofthenitrogenoxidesand,therefore,willberepresentativeoftheemissionsonlyifthegasstreamiswellmixedandtheconcentrationconstantwithtime.Multiplesamplesarerecommended.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.TheSIequivalentsareinparenthesesandmaybeapproximate.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.(Formorespecificsafetyprecautionaryinformationsee8.5andSection3.)2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD1357PracticeforPlanningtheSamplingoftheAmbientAtmosphereD1605PracticesforSamplingAtmospheresforAnalysisofGasesandVapors(Withdrawn1992)33.Terminology3.1Definitions—Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1356.4.SummaryofTestMethod4.1Thegassampleisadmittedintoanevacuatedflaskcontaininganoxidi...
