Designation:D4053–98(Reapproved2003)AnAmericanNationalStandardStandardTestMethodforBenzeneinMotorandAviationGasolinebyInfraredSpectroscopy1ThisstandardisissuedunderthefixeddesignationD4053;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthepercentbenzeneinfull-rangegasoline.Itisapplicabletoconcentra-tionsfrom0.1%to5volume%.1.2ThevaluesinSIunitsareregardedasthestandard.1.3Thistestmethodhasnotbeenvalidatedforgasolinescontainingoxygenates.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection8and9.1.2.ReferencedDocuments2.1ASTMStandards:2D4057PracticeforManualSamplingofPetroleumandPetroleumProductsE131TerminologyRelatingtoMolecularSpectroscopyE932PracticeforDescribingandMeasuringPerformanceofDispersiveInfraredSpectrophotometersE1421PracticeforDescribingandMeasuringPerformanceofFourierTransformMid-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)whereT=thetransmittanceasdefinedin3.1.5.3.1.3radiantenergy,n—energytransmittedaselectromag-neticwaves.3.1.4radiantpower,P,n—therateatwhichenergyistransportedinabeamofradiantenergy.3.1.5transmittance,T,n—themolecularpropertyofasubstancethatdeterminesitstransportabilityofradiantpower,expressedby:T5P/Po(2)where:P=theradiantpowerpa...
