Designation:D7652−11StandardTestMethodforDeterminationofTraceHydrogenSulfide,CarbonylSulfide,MethylMercaptan,CarbonDisulfideandTotalSulfurinHydrogenFuelbyGasChromatographyandSulfurChemiluminescenceDetection1ThisstandardisissuedunderthefixeddesignationD7652;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesaprocedureprimarilyforthedeterminationofhydrogensulfide,carbonylsulfide,methylmercaptan,andcarbondisulfide(Table1)inhydrogenfuelsforfuelcellvehicles(FCV)bygaschromatographwithsulfurchemiluminescencedetection.Thereportinglimitis0.02ppbv(nanomolepermoleasvolume),basedupontheanalysisofa500mLhydrogensample.Theproceduresdescribedinthismethodweredesignedtosatisfysulfurcontaminantdetermi-nationrequirementscontainedinSAETIRJ2719andtheCaliforniaCodeofRegulations,CFR,Title4,Division9,Chapter6,Article8,Sections4180–4181.1.2Thistestmethodcanbeextendedtoothersulfurspeciesinhydrogenfuelthatareelutedthroughachromatographiccolumn.1.3Thistestmethodcanbemodifiedtoanalyzeallsulfurcompoundspresentwithoutchromatographicseparation;thus,providingatotalsulfurestimationwithoutspeciation(Appen-dixX1).1.4Ifanynewsulfurcompoundsneedtobeanalyzedinhydrogenfuel,thecalibrationorspikingsulfurstandardsmustincludethesenewcompoundsaftertheirmethoddetectionlimitstudy.Inaddition,noco-elutionisallowedinthechromatographicanalysisofthecalibrationstandardcontain-ingboththenewlyaddedandtheexistingsulfurtargetcompounds.Ifnecessary,thechromatographicconditionsmaybemodifiedtoachievethisgoal.1.5Although,primarilyintendedfordeterminingsulfurinhydrogenusedasafuelforfuelcellorinternalcombustionenginepoweredvehicles,thistestmethodcanalsobeusedtomeasuresulfurcompoundsinothergaseousfuelsandgaseousmatricesprovideddataqualityobjectivesaresatisfied.1.6ThevaluesstatedinSIunitsares...
