Designation:D5504−20StandardTestMethodforDeterminationofSulfurCompoundsinNaturalGasandGaseousFuelsbyGasChromatographyandChemiluminescence1ThisstandardisissuedunderthefixeddesignationD5504;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisprimarilyforthedeterminationofspeciatedvolatilesulfur-containingcompoundsinhighmeth-anecontentgaseousfuelssuchasnaturalgas.Ithasbeensuccessfullyappliedtoothertypesofgaseoussamples,includ-ingair,digester,landfill,andrefineryfuelgas.Thedetectionrangeforsulfurcompounds,reportedaspicogramssulfur,is0.01to1000.Thisisequivalentto0.01to1000mg/m3,basedupontheanalysisofa1ccsample.1.2Therangeofthistestmethodmaybeextendedtohigherconcentrationbydilutionorbyselectionofasmallersampleloop.NOTE1—Dilutionwillreducemethodprecision.1.3Thistestmethoddoesnotpurporttoidentifyallsulfurspeciesinasample.Onlycompoundsthatareelutedthroughtheselectedcolumnunderthechromatographicconditionschosenaredetermined.Thedetectorresponsetosulfurisequimolarforallsulfurcompoundswithinthescope(1.1)ofthistestmethod.Thus,unidentifiedcompoundsaredeterminedwithequalprecisiontothatofidentifiedsubstances.Totalsulfurcontentisdeterminedfromthetotalofindividuallyquantifiedcomponents.1.4Units—ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentof...
