Designation:D3824−20StandardTestMethodsforContinuousMeasurementofOxidesofNitrogenintheAmbientorWorkplaceAtmospherebyChemiluminescence1ThisstandardisissuedunderthefixeddesignationD3824;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverproceduresforthecontinuousdeterminationoftotalnitrogendioxide(NO2)andnitricoxide(NO)asNOx,ornitricoxide(NO)aloneornitrogendioxide(NO2)alone,intherangesshowninthefollowingtable:ApproximateRangeofConcentration(25°Cand101.3kPa(1atm))GasAmbientAtmosphereWorkplaceAtmosphereµg/m3(ppm)mg/m3(ppm)NO10to600(0.01to0.5)0.6to30(0.5to25)(NO+NO2)=NOx20to1000(0.01to0.05)1to50(0.5to25)NO220to1000(0.01to0.5)1to50(0.5to25)1.2Thetestmethodsarebasedonthechemiluminescentreactionbetweennitricoxideandozone.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,seeSection9.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD1357PracticeforPlanningtheSamplingoftheAmbientAtmosphereD1914PracticeforConversionUnitsandFactorsRelatingtoSamplingandAnalysisofAtmospheresD3195/D3195MPracticeforRotameterCalibrationD3249Practicefor...
