Designation:D4084−07(Reapproved2012)StandardTestMethodforAnalysisofHydrogenSulfideinGaseousFuels(LeadAcetateReactionRateMethod)1ThisstandardisissuedunderthefixeddesignationD4084;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofhydrogensulfide(H2S)ingaseousfuels.Itisapplicabletothemeasure-mentofH2Sinnaturalgas,liquefiedpetroleumgas(LPG),substitutenaturalgas,landfillgas,sewagetreatmentoffgasses,recyclegas,flaregasses,andmixturesoffuelgases.Thismethodcanalsobeusedtomeasurethehydrogensulfideconcentrationincarbondioxide.Airdoesnotinterfere.Theapplicablerangeis0.1to16partspermillionbyvolume(ppm/v)(approximately0.1to22mg/m3)andmaybeextendedto100%H2Sbymanualorautomaticvolumetricdilution.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD1914PracticeforConversionUnitsandFactorsRelatingtoSamplingandAnalysisofAtmospheresD2420TestMethodforHydrogenSulfideinLiquefiedPetroleum(LP)Gases(LeadAcetateMethod)D3609PracticeforCalibrationTechniquesUsingPerme-ationTubesD7166PracticeforTotalSulfurAnalyzerBasedOn-line/At-lineforSulfurContentofGaseousFuelsE2165PracticeforEstablishinganUncertaintyBudgetfortheChemicalAnalysisofMetals,Ores,andRelatedMaterials(Withdrawn2007)33.SummaryofTestMethod3.1MeasurementofH2Sisaccomplishedbyratiometricallycomparingareadingofanunknownsamplewiththatofaknownstandardusingadifferentialcolorimetricdetection.PureH2Sisusedasaprimarystandardandmixedvolumetri-callywithasulfurfreematrixgasthatisideallysimilarincompositiontothesamplegas.Agaseoussampleatco...
