Designation:D6623–01AnAmericanNationalStandardStandardTestMethodforDeterminationofIndividualComponentsinSparkIgnitionEngineFuelsbyHighResolutionGasChromatography1ThisstandardisissuedunderthefixeddesignationD6623;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThistestmethodconsistsofthreeindividualproceduresdesignatedasA,B,andC.ProcedureA(DetailedHydrocarbonAnalysis-DHA)wasthefirstproceduresubmittedtobetestedanddevelopedbyASTM.ProcedureB(IndividualHydrocarbonAnalysis-IHA)isderivedfromtherevisedCanadianCAN/CGSB-3.0No.14-3-94testmethod.ProcedureC(DHC)isderivedandisconsistentwiththeFrenchStandardNFM07-086.ProceduresAandBemploy100metrepoly(dimethyl)siloxaneopentubularcapillarycolumnsandprocedureCemploysa50metrepoly(dimethyl)siloxanecapillarycolumn.Inaddition,ProcedureArequirestheuseofashortprecolumn(injectorend)locatedintheGCovenandconnectedtothe100metrecapillarycolumn.Theprecolumnisusedtooptimizeseparationselectivity.SimilarsampleswereusedtoobtaintheprecisionstatementsforProceduresAandBwhiletheprecisionforProcedureCwasobtainedwithadifferentsampleset.AllthreeproceduresusedsimilarASTMapprovedstatisticalproceduresforthecalculationoftheprecisionstatements.Althoughthethreeproceduressharesimilarinstrumentationrequirementsandpracticeofthegaschromatographicart,thescopeasindicated,apparatusdescription,reagentsandmaterials,systemoptimization,calibration,calculationandprecisionsectionsarepresentedseparatelyforeachproceduretoallowtheusertoperformeffectivelyeachprocedureaspracticedintheoriginalinterlaboratorycooperativestudy.Itisveryimportantthattheuserofthistestmethodspecifyclearlywhichprocedure(A,B,orC)wasusedwhencomparingresultswithotherlaboratoriesorreportingresults.AppendixX1ofthistestmethodcontainscomparisondataforProceduresAandBforseveralinterlaboratoryco...
