Designation:D7756−19StandardTestMethodforResiduesinLiquefiedPetroleum(LP)GasesbyGasChromatographywithLiquid,On-ColumnInjection1ThisstandardisissuedunderthefixeddesignationD7756;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedetermination,bygaschromatography,ofsolublehydrocarbonmaterials,sometimescalled“oilyresidue,”whichcanbepresentinliquefiedpetroleum(LP)gasesandwhicharesubstantiallylessvolatilethantheLPGproduct.1.2Thistestmethodquantifies,intherangeof10mg⁄kgto600mg⁄kg(ppmmass),theresiduewithaboilingpointbetween174°Cand522°C(C10toC40)inLPG.Higherboilingmaterials,ormaterialsthatadherepermanentlytothechromatographiccolumn,willnotbedetected.1.3AppendixX3,AppendixX4,andAppendixX6describeadditionalapplicationswhichcouldbeperformedbasedonthehardwareandproceduresdescribedinthistestmethod.Appen-dixX3describesatestprocedureforexpandingtheanalysisrangetobenzene,AppendixX4describesatestprocedurefortheanalysisofdiisopropanolamine,andAppendixX6de-scribesatestprocedurefortheanalysisofheavyresiduesorcontaminantsfromC40toaboutC60inLPG.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocumen...
