Designation:D2420−13StandardTestMethodforHydrogenSulfideinLiquefiedPetroleum(LP)Gases(LeadAcetateMethod)1ThisstandardisissuedunderthefixeddesignationD2420;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethod2coversthedetectionofhydrogensulfideinliquefiedpetroleum(LP)gases.Thesensitivityofthetestisabout4mg/m3(0.15to0.2grainofhydrogensulfideper100ft3)ofgas.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3D1193SpecificationforReagentWaterD1265PracticeforSamplingLiquefiedPetroleum(LP)Gases,ManualMethodD1835SpecificationforLiquefiedPetroleum(LP)Gases2.2GPAStandard:4GPA2140LiquefiedPetroleumGasSpecificationsandTestMethods3.SummaryofTestMethod3.1VaporizedLPgasispassedovermoistleadacetatepaperundercontrolledconditions.Hydrogensulfidereactswithleadacetatetoformleadsulfidewhichproducesacolorationonthepapervaryingfromyellowtoblack,dependingupontheamountofhydrogensulfidepresent.4.SignificanceandUse4.1Liquefiedpetroleumgasesandtheirproductsofcom-bustionmustnotbeundulycorrosivetothematerialswithwhichtheycomeincontact.ThepotentialpersonnelexposurehazardsofH2Salsomakethedetectionandmeasurementofhydrogensulfideimportant,eveninlowconcentrations.Inaddition,insomecasestheodorofthegasesshallnotbeobjectionable.(SeeSpecificationD1835andGPA2140.)5.Interferences5.1Methylmercaptan,ifpresent,producesatransitoryyellowstainontheleadacetatepaperthatwillfadecompletelyinlessthan5min.5.2Othersulfurcompoundspresentinliquefiedpetroleumgasdonot...
