Designation:D3237−12StandardTestMethodforLeadinGasolinebyAtomicAbsorptionSpectroscopy1ThisstandardisissuedunderthefixeddesignationD3237;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationofthetotalleadcontentofgasolinewithintheconcentrationrangeof0.010to0.10goflead/U.S.gal(2.5to25mg/L).Thistestmethodcompensatesforvariationsingasolinecompositionandisindependentofleadalkyltype.1.2ThevaluesgiveningramsperU.S.gallonaretoberegardedasthestandardintheUnitedStates.Notethatinothercountries,otherunitscanbepreferred.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,see6.6and6.8.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD1368TestMethodforTraceConcentrationsofLeadinPrimaryReferenceFuels(Withdrawn1994)3D2550MethodofTestforWaterSeparationCharacteristicsofAviationTurbineFuels(Withdrawn1989)3D3116TestMethodforTraceAmountsofLeadinGasoline(Withdrawn1994)3D4057PracticeforManualSamplingofPetroleumandPetroleumProductsD6299PracticeforApplyingStatisticalQualityAssuranceandControlChartingTechniquestoEvaluateAnalyticalMeasurementSystemPerformanceD6792PracticeforQualitySysteminPetroleumProductsandLubricantsTestingLaboratoriesD7740PracticeforOptimization,Calibration,andValida-tionofAtomicAbsorptionSpectrometryforMetalAnaly-sisofPetroleumProductsandLubricants3.SummaryofTestMethod3.1Thegasolinesampleisdilutedwithmethylisobutylketoneandthealkylleadcomponentsarestabilizedbyreactionwithiodineandaquaternaryammoniumsalt.Theleadcontentof...
