Designation:D6428–99TestMethodforTotalSulfurinLiquidAromaticHydrocarbonsandTheirDerivativesbyOxidativeCombustionandElectrochemicalDetection1ThisstandardisissuedunderthefixeddesignationD6428;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthetotalsulfurnaturallyfoundinliquidaromatichydrocarbons,theirderivativesandrelatedchemicals.1.2Thistestmethodisapplicableforsamplescontainingsulfurfrom0.05to100mgS/kg.1.3Thedetectorresponseforthistechniquewithinthescopeofthistestmethodislinearwithsulfurconcentration.1.4Thefollowingappliestoallspecifiedlimitsinthistestmethodforpurposesofdeterminingconformancewiththistestmethod,anobservedvalueoracalculatedvalueshallberoundedoff“tothenearestunit”inthelastright-handdigitusedinexpressingthespecificationlimit,inaccordancewiththerounding-offmethodofPracticeE29.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection9,andNotes2-4andNote7.2.ReferencedDocuments2.1ASTMStandards:D3437PracticeforSamplingandHandlingLiquidCyclicProducts2D3852PracticeforSamplingandHandlingPhenolandCresylicAcidE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications32.2OtherDocumentsOSHARegulations,29CFR,paragraphs1910.1000and1910.120043.Terminology3.1Definitions:3.1.1oxidativecombustion,n—processinwhichasampleundergoescombustioninanoxygenrichenvironmentattemperaturesgreaterthanof650°Candcompoundsdecomposetocarbondioxide,water,andelementaloxides.3.1.2quartzcombustiontubedevitrification,n—thesug-gestedmaximumtemperatureforaquartzcombustiontubeis1200°C.3.1....
