Designation:D3961–98StandardTestMethodforTraceQuantitiesofSulfurinLiquidAromaticHydrocarbonsbyOxidativeMicrocoulometry1ThisstandardisissuedunderthefixeddesignationD3961;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddeterminestotalsulfurcontentinaromatichydrocarbons,theirderivatives,andrelatedchemi-cals.1.2Thistestmethodisapplicabletosampleswithsulfurconcentrationsfrom0.5to100mg/kg.1.3Thefollowingappliestoallspecifiedlimitsinthistestmethod:forpurposesofdeterminingconformancewiththistestmethod,anobservedvalueoracalculatedvalueshallberoundedoff“tothenearestunit”inthelastright-handdigitusedinexpressingthespecificationlimit,inaccordancewiththerounding-offmethodofPracticeE29.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection9.2.ReferencedDocuments2.1ASTMStandards:D1193SpecificationforReagentWater2D3437PracticeforSamplingandHandlingLiquidCyclicProducts3E29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications42.2OtherDocument:OSHARegulations-29CFRparagraphs1910.1000and1910.120053.Terminology3.1Definitions:3.1.1dehydrationtube—achambercontainingphosphoricacid85%thatscrubstheeffluentgasesfromcombustiontoremovewatervapor.3.1.2oxidativepyrolysis—aprocessinwhichasampleiscombustedinanoxygen-richatmosphereathightemperaturetobreakdownthecomponentsofthesampleintoelementaloxides.3.1.3recoveryfactor—anindicationoftheefficiencyofthemeasurementcomputedbydividingthemeasuredvalueofastandardbyitstheoreticalvalue.3.1.4referencesensorpair—detectschangesintriiodideionconcentrations.3.1.5titrationpa...
