Designation:D8144−22StandardTestMethodforSeparationandDeterminationofAromatics,Nonaromatics,andFAMEFractionsinMiddleDistillatesbySolid-PhaseExtractionandGasChromatography1ThisstandardisissuedunderthefixeddesignationD8144;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoverstheseparationanddetermina-tionofrepresentativearomatics,nonaromatics,andfattyacidmethylester(FAME)fractionsinmiddledistillatesthatboilbetween170°Cand400°C,includingbiodieselblendswithupto20%byvolumeofFAME,bysolidphaseextractionandgaschromatography.1.2Thistestmethodprovidestwoprocedures,AandB.ProcedureAisapplicabletothepetroleum-basedmiddledistillatesfuel,andProcedureBisapplicabletothebiodieselblendswithupto20%byvolumeofFAME.1.3Thistestmethodisapplicabletomiddledistillatessampleswitharomaticscontentrangingfrom5%to50%bymassandbiodieselblendswithFAMEcontentintherangeof0.5%to20%byvolume.Thistestmethodmayapplytoconcentrationsoutsidetheseranges,buttheprecisionhasnotbeendetermined.1.4ForProcedureB,biodieselsintheformoffattyacidethylester(FAEE)canalsofullyeluteintotheFAMEfraction,andtheyhavethesimilarFID(flameionizationdetector)relativeresponsefactorswiththatofFAME.ThedeterminedcontentofFAMEfractionsarethesumofconcentrationsofFAMEandFAEEbythistestmethod(see3.2.5).1.5FromtheinvestigationresultsobtainedforFAMEdetermination,thelowconcentrationsofmonoglycerides(usu-allylessthan0.5%bymassinbiodieselblends)arenotdetectableunderthegaschromatographic(GC)conditionofthistestmethodandwillnotinterferewiththedeterminationofFAMEbyProcedureB.Asaresult,biodieselblends,conform-ingtotherequirementsofSpecificationD7467,containingupto20%byvolumeofbiodieselblendstockmeetingtherequirementsinSpecificationD6751,typicallycontainconcen-trationsofmonoglyceridesoflessthan0.1%bymass.Thediglyceride...
