Designation:D3608−19StandardTestMethodforNitrogenOxides(Combined)ContentintheAtmospherebytheGriess-SaltzmanReaction1ThisstandardisissuedunderthefixeddesignationD3608;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemanualdeterminationofthecombinednitrogendioxide(NO2)andnitricoxide(NO)content,totalNOx;intheatmosphereintherangefrom4to10000µg/m3(0.002to5ppm(v)).1.2Themaximumsamplingperiodis60minataflowrateof0.4L/min.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1071TestMethodsforVolumetricMeasurementofGas-eousFuelSamplesD1193SpecificationforReagentWaterD1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD1357PracticeforPlanningtheSamplingoftheAmbientAtmosphereD3195PracticeforRotameterCalibrationD3609PracticeforCalibrationTechniquesUsingPerme-ationTubesD3631TestMethodsforMeasuringSurfaceAtmosphericPressureE1SpecificationforASTMLiquid-in-GlassThermometersE128TestMethodforMaximumPoreDiameterandPerme-abilityofRigidPorousFiltersforLaboratoryUse3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1356.4.SummaryofTestMethod4.1TheNOisquantitatively(1)3convertedtoNO2by...
