Designation:D7169−11StandardTestMethodforBoilingPointDistributionofSampleswithResiduesSuchasCrudeOilsandAtmosphericandVacuumResiduesbyHighTemperatureGasChromatography1ThisstandardisissuedunderthefixeddesignationD7169;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationoftheboilingpointdistributionandcutpointintervalsofcrudeoilsandresiduesbyusinghightemperaturegaschromatography.Theamountofresidue(orsamplerecovery)isdeterminedusinganexternalstandard.1.2Thistestmethodextendstheapplicabilityofsimulateddistillationtosamplesthatdonotelutecompletelyfromthechromatographicsystem.Thistestmethodisusedtodeterminetheboilingpointdistributionthroughatemperatureof720°C.Thistemperaturecorrespondstotheelutionofn-C100.1.3Thistestmethodisusedforthedeterminationofboilingpointdistributionofcrudeoils.Thistestmethodusescapillarycolumnswiththinfilms,whichresultsintheincompleteseparationofC4-C8inthepresenceoflargeamountsofcarbondisulfide,andthusyieldsanunreliableboilingpointdistribu-tioncorrespondingtothiselutioninterval.Inaddition,quench-ingoftheresponseofthedetectoremployedtohydrocarbonselutingduringcarbondisulfideelution,resultsinunreliablequantitativeanalysisoftheboilingdistributionintheC4-C8region.Sincethedetectordoesnotquantitativelymeasurethecarbondisulfide,itssubtractionfromthesampleusingasolvent-onlyinjectionandcorrectionstothisregionviaquenchingfactors,resultsinanapproximatedeterminationofthenetchromatographicarea.Aseparate,higherresolutiongaschromatograph(GC)analysisofthelightendportionofthesamplemaybenecessaryinordertoobtainamoreaccuratedescriptionoftheboilingpointcurveintheintervalinquestion(seeAppendixX1).1.4Thistestmethodisalsodesignedtoobtaintheboilingpointdistributionofotherincompletelyelutingsamplessuchasatmosphericresidu...
