Designation:D5351−93(Reapproved2021)StandardTestMethodforDeterminationofOrganicallyCombinedSulfuricAnhydridebyExtractionTitration,TestMethodB1ThisstandardisissuedunderthefixeddesignationD5351;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheorgani-callycombinedsulfuricanhydrideexistinginasampleofsulfatedoilbyextractingtheundecomposedsulfatedfatandotherfattymatteroveranacidulated,concentratedsaltsolution,boilingtheresiduewithsulfuricacidafterevaporat-ingthesolvent,andtitratingtheproductsofreaction.ThistestmethodisapplicableonlytosulfatedoilsthatsplitofftheircombinedSO3uponboilingwithmineralacids,includingsamplescontainingsodiumacetateorothercompoundsthatcannotbeaccuratelytitratedinwatersolutionwithmethylorangeastheindicator.ThistestmethodwasderivedfromTestMethodsD500,Sections20through24,andALCAMethodH-43.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareprovidedforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D500TestMethodsofChemicalAnalysisofSulfonatedandSulfatedOils2.2OtherDocument:ALCAMethodH-43OrganicallyCombinedSulfuricAnhy-drideExtractionTitrationTest(forSulfatedOils)33.SignificanceandUse3.1Thistestmethodisintendedforthedeterm...
