Designation:D2913−20StandardTestMethodforMercaptanContentoftheAtmosphere1ThisstandardisissuedunderthefixeddesignationD2913;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisforthemeasurementofmercaptans(organicthiols)intheatmosphereatconcentrationsbelow100partsperbillion(ppb(v)=195µg/m3).Forconcentrationsabove100ppb(v),thesamplingperiodcanbereducedorthetrappingliquidvolumeincreasedeitherbeforeorafteraspirat-ing.(SeePracticeD1357forsamplingguidance.)Themini-mumdetectableamountofmethylmercaptanis0.04µg/mL(1)2inafinalliquidvolumeof25mL.Whensamplingairatthemaximumrecommendedrateof2L/minfor2h,theminimumdetectablemercaptanconcentrationis1.0ppb(v)(1.95µgmethylmercaptan/m3at101.3kPa(760mmHg)and25°C).Thistestmethoddeterminestotalmercaptansanddoesnotdifferentiateamongindividualmercaptans,althoughitismostsensitivetothelowermolecularweightalkanethiols.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Specificprecautionarystatementsaregivenin8.7,8.8,andSection9.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3D1193SpecificationforReagentWaterD1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD1357PracticeforPlanningtheSamplingoftheAmbientAtmosphereD1914Practice...
