Designation:D6733−01(Reapproved2020)StandardTestMethodforDeterminationofIndividualComponentsinSparkIgnitionEngineFuelsby50-MetreCapillaryHighResolutionGasChromatography1ThisstandardisissuedunderthefixeddesignationD6733;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofindividualhydrocarboncomponentsofspark-ignitionenginefuelswithboilingrangesupto225°C.Otherlightliquidhydrocarbonmixturestypicallyencounteredinpetroleumrefiningoperations,suchas,blendingstocks(naphthas,reformates,alkylates,andsoforth)mayalsobeanalyzed;however,statisticaldatawasobtainedonlywithblendedspark-ignitionenginefuels.ThetablesinAnnexA1enumeratethecompo-nentsreported.Componentconcentrationsaredeterminedintherangefrom0.10%to15%bymass.Theproceduremaybeapplicabletohigherandlowerconcentrationsfortheindividualcomponents;however,theusermustverifytheaccuracyiftheproceduresareusedforcomponentswithconcentrationsout-sidethespecifiedranges.1.2Thistestmethodisapplicablealsotospark-ignitionenginefuelblendscontainingoxygenatedcomponents.However,inthiscase,theoxygenatecontentmustbedeter-minedbyTestMethodsD5599orD4815.1.3Benzeneco-eluteswith1-methylcyclopentene.BenzenecontentmustbedeterminedbyTestMethodD3606orD5580.1.4Tolueneco-eluteswith2,3,3-trimethylpentane.ToluenecontentmustbedeterminedbyTestMethodD3606orD5580.1.5Althoughamajorityoftheindividualhydrocarbonspresentaredetermined,someco-elutionofcompoundsisencountered.Ifthisprocedureisutilizedtoestimatebulkhydrocarbongroup-typecomposition(PONA)theuserofsuchdatashouldbecautionedthaterrormaybeencounteredduetoco-elutionandalackofidentificationofallcomponentspresent.Samplescontainingsignificantamountsofnaphthenic(forexample,virginnaphthas)constituentsaboven-octanemayreflectsignificanterrorsinPONAtypegroupings....
