Designation:D2789−95(Reapproved2016)StandardTestMethodforHydrocarbonTypesinLowOlefinicGasolinebyMassSpectrometry1ThisstandardisissuedunderthefixeddesignationD2789;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationbymassspectrometryofthetotalparaffins,monocycloparaffins,dicycloparaffins,alkylbenzenes,indansortetralinsorboth,andnaphthalenesingasolinehavinganolefincontentoflessthan3%byvolumeanda95%distillationpointoflessthan210°C(411°F)asdeterminedinaccordancewithTestMethodD86.OlefinsaredeterminedbyTestMethodD1319,orbyTestMethodD875.1.2Ithasnotbeendeterminedwhetherthistestmethodisapplicabletogasolinecontainingoxygenatedcompounds(forexample,alcoholsandethers).1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D86TestMethodforDistillationofPetroleumProductsandLiquidFuelsatAtmosphericPressureD875MethodforCalculatingofOlefinsandAromaticsinPetroleumDistillatesfromBromineNumberandAcidAbsorption(Withdrawn1984)3D1319TestMethodforHydrocarbonTypesinLiquidPetro-leumProductsbyFluorescentIndicatorAdsorptionD2001TestMethodforDepentanizationofGasolineandNaphthasD2002PracticeforIsolationofRepresentativeSaturatesFractionfromLow-OlefinicPetroleumNaphthas(With-drawn1998)33.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1Thesummationsofcharacteristicmassfragmentsaredefinedasfollows(equationsareidenticaltothosein11.1):(43~paraffins!5totalpeakheightofm/e143157171185199.(1)(41~monocycloparaffins!5t...
