Designation:D7551−10(Reapproved2015)StandardTestMethodforDeterminationofTotalVolatileSulfurinGaseousHydrocarbonsandLiquefiedPetroleumGasesandNaturalGasbyUltravioletFluorescence1ThisstandardisissuedunderthefixeddesignationD7551;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftotalvolatilesulfuringaseoushydrocarbons,LiquefiedPetroleumGases(LPG)andLiquefiedNaturalGas(LNG).Itisapplicabletoanalysisofnaturalgaseousfuels,processintermediates,finalproducthydrocarbonsandgenericgaseousfuelscontainingsulfurintherangeof1to200mg/kg.Samplescanalsobetestedatothertotalsulfurlevelsusingeitherpre-concentrationmethodsorsampledilutionusingadiluentgas.Themethod-ologyforpreconcentrationanddilutiontechniquesisnotcoveredinthistestmethod.Theprecisionstatementdoesnotapplyifthesetechniquesareusedinconjunctionwiththistestmethod.Thediluentgas,suchasUHPnitrogen,zeronitrogenorzeroair,shallnothaveasignificanttotalsulfurconcentra-tion.1.2Thistestmethodmaynotdetectsulfurcompoundsthatdonotvolatilizeundertheconditionsofthetest.1.3Thistestmethodcoversthelaboratorydeterminationandtheat-line/on-linedeterminationoftotalvolatilesulfuringaseousfuels,LPG,andLNG.1.4Thistestmethodisapplicablefortotalvolatilesulfurdeterminationingaseoushydrocarbons,LPG,andLNGcon-taininglessthan0.35mole%halogen(s).1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.SeeSections4.1,7.3,7.4,11.2,andSection8.2.ReferencedDocuments2.1ASTMStandards:2D1070TestMethodsforRelativeDensityofGaseou...
