Designation:D7039−15aStandardTestMethodforSulfurinGasoline,DieselFuel,JetFuel,Kerosine,Biodiesel,BiodieselBlends,andGasoline-EthanolBlendsbyMonochromaticWavelengthDispersiveX-rayFluorescenceSpectrometry1ThisstandardisissuedunderthefixeddesignationD7039;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationoftotalsulfurbymonochromaticwavelength-dispersiveX-rayfluorescence(MWDXRF)spectrometryinsingle-phasegasoline,dieselfuel,refineryprocessstreamsusedtoblendgasolineanddiesel,jetfuel,kerosine,biodiesel,biodieselblends,andgasoline-ethanolblends.NOTE1—Volatilesamplessuchashigh-vapor-pressuregasolinesorlighthydrocarbonsmightnotmeetthestatedprecisionbecauseoftheevaporationoflightcomponentsduringtheanalysis.1.2Therangeofthistestmethodisbetweenthepooledlimitofquantitation(PLOQ)value(calculatedbyprocedurescon-sistentwithPracticeD6259)of3.2mg⁄kgtotalsulfurandthehighestlevelsampleintheroundrobin,2822mg⁄kgtotalsulfur.1.3Samplescontainingoxygenatescanbeanalyzedwiththistestmethodprovidedthematrixofthecalibrationstan-dardsiseithermatchedtothesamplematricesorthematrixcorrectiondescribedinSection5orAnnexA1isappliedtotheresults.Theconditionsformatrixmatchingandmatrixcorrec-tionareprovidedintheInterferencessection(Section5).1.4Sampleswithsulfurcontentabove2822mg⁄kgcanbeanalyzedafterdilutionwithappropriatesolvent(see5.4).Theprecisionandbiasofsulfurdeterminationsondilutedsampleshasnotbeendeterminedandmaynotbethesameasshownforneatsamples(Section15).1.5Whentheelementalcompositionofthesamplesdiffersignificantlyfromthecalibrationstandardsusedtopreparethecalibrationcurve,thecautionsandrecommendationinSection5shouldbecarefullyobserved.1.6ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1....
