Designation:D7419−13StandardTestMethodforDeterminationofTotalAromaticsandTotalSaturatesinLubeBasestocksbyHighPerformanceLiquidChromatography(HPLC)withRefractiveIndexDetection1ThisstandardisissuedunderthefixeddesignationD7419;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationoftotalaromaticsandtotalsaturatesinadditive-freelubebasestocksusinghighperformanceliquidchromatography(HPLC)withrefractiveindex(RI)detection.Thistestmethodisapplicabletosamplescontainingtotalaromaticsintheconcentrationrangeof0.2to46mass%.1.1.1Polarcompounds,ifpresent,arecombinedwiththetotalaromatics.Precisionwasdeterminedforbasestockswithpolarscontent<1.0mass%.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4177PracticeforAutomaticSamplingofPetroleumandPetroleumProductsD6299PracticeforApplyingStatisticalQualityAssuranceandControlChartingTechniquestoEvaluateAnalyticalMeasurementSystemPerformance3.Terminology3.1Definitions:3.1.1aromatics,n—inhighperformanceliquidchromatography,aromatichydrocarboncomponents,minuspolarmaterial,thathasalongerretentiontimethansaturatesonthespecifiedpolarcolumns,butcanberemovedasasinglepeakbybackflushingthecolumnswithheptane.3.1.1.1Discussion—Generally,aromatichydrocarbonscon-tain1to4rings.3.1.2backflush,v—elutionoftheHPLCmobilephaseinthebackwardorreversedirectionfromthesilicagelcolumntowardsthecyanocolumn.3.1.2.1Discussio...
