Designation:D3246−15StandardTestMethodforSulfurinPetroleumGasbyOxidativeMicrocoulometry1ThisstandardisissuedunderthefixeddesignationD3246;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversdeterminationofsulfurintherangefrom1.5to100mg/kg(ppmbymass)byweightinhydrocarbonproductsthataregaseousatnormalroomtem-peratureandpressure.NOTE1—Thetestmethodhasbeentestedcooperativelyonlyonhigh-purityethylenegas.Precisiondatahavenotbeendevelopedforotherproducts.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1265PracticeforSamplingLiquefiedPetroleum(LP)Gases,ManualMethodD1193SpecificationforReagentWaterD3120TestMethodforTraceQuantitiesofSulfurinLightLiquidPetroleumHydrocarbonsbyOxidativeMicrocou-lometryD6299PracticeforApplyingStatisticalQualityAssuranceandControlChartingTechniquestoEvaluateAnalyticalMeasurementSystemPerformanceF307PracticeforSamplingPressurizedGasforGasAnaly-sis2.2OtherStandards:CompressedGasAssociationBookletsG-4andG-4-1ontheUseofOxygen33.SummaryofTestMethod3.1Asampleisinjectedintoacombustiontubemaintainedatabout800°Chavingaflowingstreamofgascontainingabout80%oxygenand20%inertgas(forexample,nitrogen,argon,etc.).Oxidativepyrolysisconvertsthesulfurtosulfurdioxidewhichthenflowsintoatitrationcellwhereitreactswithtriiodideionpresentintheelectrolyte.Thetriiodidethusconsumed,iscoulometricallyreplacedandthetotalcurrentrequiredtoreplaceitisameasureofthesulfurpresentinthesampleinjected.3.2Thereactionocc...
