Designation:D6839−15StandardTestMethodforHydrocarbonTypes,OxygenatedCompoundsandBenzeneinSparkIgnitionEngineFuelsbyGasChromatography1ThisstandardisissuedunderthefixeddesignationD6839;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthequantitativedeterminationofsaturates,olefins,aromaticsandoxygenatesinspark-ignitionenginefuelsbymultidimensionalgaschromatography.Eachhydrocarbontypecanbereportedeitherbycarbonnumber(seeNote1)orasatotal.NOTE1—TherecanbeanoverlapbetweentheC9andC10aromatics;however,thetotalisaccurate.IsopropylbenzeneisresolvedfromtheC8aromaticsandisincludedwiththeotherC9aromatics.1.2Thistestmethodisapplicabletospark-ignitionenginefuelwithtotalaromaticcontentupto50%(V/V),totalolefiniccontentupto30%(V/V)andoxygencompoundsupto15%(V/V).1.3Thistestmethodisnotintendedtodetermineindividualhydrocarboncomponentsexceptbenzene.1.4OxygenatesasspecifiedinTestMethodD4815havebeenverifiednottointerferewithhydrocarbons.Withintheroundrobinsampleset,thefollowingoxygenateshavebeentested:MTBE,ethanol,ETBE,andTAME.OtheroxygenatescanbedeterminedandquantifiedusingTestMethodD4815orD5599.1.5ThistestmethodincludesarelativebiassectionforU.S.EPAspark-ignitionenginefuelregulationsfortotalolefinsreportingbasedonPracticeD6708accuracyassessmentbe-tweenTestMethodD6839andTestMethodD1319asapossibleTestMethodD6839alternativetoTestMethodD1319.ThePracticeD6708derivedcorrelationequationisonlyapplicableforfuelsinthetotalolefinsconcentrationrangefrom0.2%to18.2%byvolumeasmeasuredbyTestMethodD6839.TheapplicableTestMethodD1319rangefortotalolefinsisfrom0.6%to20.6%byvolumeasreportedbyTestMethodD1319.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns...
