Designation:D1840−07(Reapproved2017)StandardTestMethodforNaphthaleneHydrocarbonsinAviationTurbineFuelsbyUltravioletSpectrophotometry1ThisstandardisissuedunderthefixeddesignationD1840;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedetermination,byultravioletspectrophotometry,ofthetotalconcentrationofnaphthalene,acenaphthene,andalkylatedderivativesofthesehydrocarbonsinjetfuels.Thistestmethodisdesignedtoanalyzefuelscontainingnotmorethan5%ofsuchcomponentsandhavingendpointsbelow315°C(600°F);however,therangeofconcentrationsusedintheinterlaboratorytestprogramswhichestablishedtheprecisionstatementsforthistestmethodwere0.03%to4.25%byvolumeforProcedureA,and0.08%to5.6%byvolumeforProcedureB.Thistestmethoddeterminesthemaximumamountofnaphthalenesthatcouldbepresent.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecificwarningstatements,see8.1and8.2.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2E131TerminologyRelatingtoMolecularSpectroscopyE169PracticesforGeneralTechniquesofUltraviolet-VisibleQuantitativeAnalysisE275PracticeforDescribingandMeasuringPerformanceofUltravioletandVisible...
