Designation:D4053−04(Reapproved2009)StandardTestMethodforBenzeneinMotorandAviationGasolinebyInfraredSpectroscopy1ThisstandardisissuedunderthefixeddesignationD4053;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthepercentbenzeneinfull-rangegasoline.Itisapplicabletoconcentra-tionsfrom0.1%to5volume%.1.2Thistestmethodhasnotbeenvalidatedforgasolinescontainingoxygenates.Certainoxygenatesinterferewiththemeasurementdescribedinthistestmethod.TestMethodD6277isrecommendedforgasolinescontainingoxygenates.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificwarningstatements,seeSection8and9.1.2.ReferencedDocuments2.1ASTMStandards:2D4057PracticeforManualSamplingofPetroleumandPetroleumProductsD6277TestMethodforDeterminationofBenzeneinSpark-IgnitionEngineFuelsUsingMidInfraredSpectroscopyE131TerminologyRelatingtoMolecularSpectroscopyE932PracticeforDescribingandMeasuringPerformanceofDispersiveInfraredSpectrometersE1421PracticeforDescribingandMeasuringPerformanceofFourierTransformMid-Infrared(FT-MIR)Spectrom-eters:LevelZeroandLevelOneTests3.Terminology3.1Definitions:3.1.1Definitionsoftermsandsymbolsrelatingtoabsorp-tionspectroscopyinthistestmethodshallconformtoTermi-nologyE131.Termsofparticularsignificancearethefollow-ing:3.1.2absorbance,A,n—themolecularpropertyofasub-stancethatdeterminesitsabilitytotakeupradiantpower,expressedby:A5log10~1/T!52log10T(1)where:T=thetransmittanceasdefinedin3.1.5.3.1.3radiantenergy,n—energytransmit...
