Designation:D7371−14(Reapproved2022)StandardTestMethodforDeterminationofBiodiesel(FattyAcidMethylEsters)ContentinDieselFuelOilUsingMidInfraredSpectroscopy(FTIR-ATR-PLSMethod)1ThisstandardisissuedunderthefixeddesignationD7371;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthecontentoffattyacidmethylesters(FAME)biodieselindieselfueloils.Itisapplicabletoconcentrationsfrom1.00%to20%byvolume(seeNote1).ThisprocedureisapplicableonlytoFAME.Biodieselintheformoffattyacidethylesters(FAEE)willcauseanegativebias.NOTE1—UsingtheproperATRsampleaccessory,therangemaybeexpandedfrom1%to100%byvolume,howeverprecisiondataisnotavailableabove20%byvolume.1.2ThevaluesstatedinSIunitsofmeasurementaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D975SpecificationforDieselFuelD976TestMethodforCalculatedCetaneIndexofDistillateFuelsD1298TestMethodforDensity,RelativeDensity,orAPIGravityofCrudePetroleumandLiquidPetroleumProd-uctsbyHydrometerMethodD4052TestMethodforDensity,RelativeDensity,andAPIGravityofLiquidsbyDigitalDensityMeterD4057PracticeforManualSamplingofPetroleumandPetroleumProductsD4177PracticeforAutomaticSamplingofPetroleumandPetroleu...
