ASTM_D_7371_-_14_2022.pdf

Designation:D737114(Reapproved 2022)Standard Test Method forDetermination of Biodiesel(Fatty Acid Methyl Esters)Content in Diesel Fuel Oil Using Mid Infrared Spectroscopy(FTIR-ATR-PLS Method)1This standard is issued under the fixed designation D7371;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the contentof fatty acid methyl esters(FAME)biodiesel in diesel fuel oils.It is applicable to concentrations from 1.00%to 20%byvolume(see Note 1).This procedure is applicable only toFAME.Biodiesel in the form of fatty acid ethyl esters(FAEE)will cause a negative bias.NOTE1Using the proper ATR sample accessory,the range may beexpanded from 1%to 100%by volume,however precision data is notavailable above 20%by volume.1.2 The values stated in SI units of measurement are to beregarded as the standard.The values given in parentheses arefor information only.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D975 Specification for Diesel FuelD976 Test Method for Calculated Cetane Index of DistillateFuelsD1298 Test Method for Density,Relative Density,or APIGravity of Crude Petroleum and Liquid Petroleum Prod-ucts by Hydrometer MethodD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD4737 Test Method for Calculated Cetane Index by FourVariable EquationD5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum ProductsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6751 Specification for Biodiesel Fuel Blend Stock(B100)for Middle Distillate FuelsD7467 Specification for Diesel Fuel Oil,Biodiesel Blend(B6 to B20)E168 Practices for General Techniques of Infrared Quanti-tative AnalysisE1655 Practices for Infrared Multivariate QuantitativeAnalysisE2056 Practice for Qualifying Spectrometers and Spectro-photometers for Use in Multivariate Analyses,CalibratedUsing Surrogate Mixtures3.Terminology3.1 Definitions:3.1.1 biodiesel,na fuel comprised of mono-alkyl esters oflong chain fatty acids derived from vegetable oils or animalfats,designated B100.D67513.1.2 biodiesel blend,BXX,na blend of biodiesel fuelwith petroleum-based diesel fuel.D74673.1.2.1 DiscussionIn the abbreviation BXX,the XX rep-resents the volume percentage of biodiesel fuel in the blend.D67513.1.3 diesel fuel,npetroleum-based middle distillate fuel.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.04.0F on Absorption Spectroscopic Methods.Current edition approved July 1,2022.Published August 2022.Originallyapproved in 2007.Last previous edition approved in 2014 as D7371 14.DOI:10.1520/D7371-14R22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.1.4 multivariate calibration,nprocess for creating amodel that relates component concentrations or properties tothe absorbances of a set of known reference samples at morethan one wavelength or frequency.E16553.1.4.1 DiscussionThe resultant multivariate calibrationmodel is applied to the analysis of spectra of unknown samplesto provide an estimate of the component concentration orproperty values for the unknown sample.3.1.4.2 DiscussionThe multivaria