Designation:D4952−12StandardTestMethodforQualitativeAnalysisforActiveSulfurSpeciesinFuelsandSolvents(DoctorTest)1ThisstandardisissuedunderthefixeddesignationD4952;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*1.1Thistestmethodcoversandisintendedprimarilyforthedetectionofmercaptansinmotorfuel,kerosine,andsimilarpetroleumproducts.Thismethodmayalsoprovideinformationonhydrogensulfideandelementalsulfurthatmaybepresentinthesesampletypes.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD3227TestMethodfor(ThiolMercaptan)SulfurinGasoline,Kerosine,AviationTurbine,andDistillateFuels(PotentiometricMethod)2.2EnergyInstituteStandards:3IP30DetectionofMercaptans,HydrogenSulfide,ElementalSulfur,andPeroxides–DoctorTestMethod3.SummaryofTestMethod3.1Thesampleisshakenwithsodiumplumbitesolution,asmallquantityofpowderedsulfuradded,andthemixtureshakenagain.Thepresenceofmercaptansorhydrogensulfideorbothisindicatedbydiscolorationofthesulfurfloatingattheoil-waterinterfaceorbydiscolorationofeitherofthephases.4.SignificanceandUse4.1Sulfurpresentasmercaptansorashydrogensulfideindistillatefuelsandsolventscanattackmanymetallicandnon-metallicmaterialsinfuelandotherdistributionsystems.Anegativeresultinthedoctortestensuresthattheconcentrationofthesecompoundsisinsufficienttocausesuchproblemsinnormaluse.5.Interferences5.1Thistestcannotbeusediftherearemor...
