Designation:D2622−16StandardTestMethodforSulfurinPetroleumProductsbyWavelengthDispersiveX-rayFluorescenceSpectrometry1ThisstandardisissuedunderthefixeddesignationD2622;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationoftotalsulfurinpetroleumandpetroleumproductsthataresingle-phaseandeitherliquidatambientconditions,liquefiablewithmoderateheat,orsolubleinhydrocarbonsolvents.Thesematerialscanincludedieselfuel,jetfuel,kerosene,otherdistillateoil,naphtha,residualoil,lubricatingbaseoil,hydraulicoil,crudeoil,unleadedgasoline,gasoline-ethanolblends,andbiodiesel.1.2TherangeofthistestmethodisbetweenthePLOQvalue(calculatedbyproceduresconsistentwithPracticeD6259)of3mg/kgtotalsulfurandthehighestlevelsampleintheroundrobin,4.6weight%totalsulfur.NOTE1—Instrumentationcoveredbythistestmethodcanvaryinsensitivity.Theapplicabilityofthetestmethodatsulfurconcentrationsbelow3mg⁄kgmaybedeterminedonanindividualbasisforWDXRFinstrumentscapableofmeasuringlowerlevels,butprecisioninthistestmethoddoesnotapply.1.2.1Thevaluesofthelimitofquantitation(LOQ)andmethodprecisionforaspecificlaboratory’sinstrumentdependsoninstrumentsourcepower(loworhighpower),sampletype,andthepracticesestablishedbythelaboratorytoperformthemethod.1.3Samplescontainingmorethan4.6mass%sulfurshouldbedilutedtobringthesulfurconcentrationofthedilutedmaterialwithinthescopeofthistestmethod.SamplesthataredilutedcanhavehighererrorsthanindicatedinSection14thannon-dilutedsamples.1.4Volatilesamples(suchashighvaporpressuregasolinesorlighthydrocarbons)maynotmeetthestatedprecisionbecauseofselectivelossoflightmaterialsduringtheanalysis.1.5Afundamentalassumptioninthistestmethodisthatthestandardandsamplematricesarewell...
