1、Designation:D627707(Reapproved 2022)Standard Test Method forDetermination of Benzene in Spark-Ignition Engine FuelsUsing Mid Infrared Spectroscopy1This standard is issued under the fixed designation D6277;the number immediately following the designation indicates the year oforiginal adoption or,in t
2、he 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 per-centage of benzene in spark-ignition e
3、ngine fuels.It is appli-cable to concentrations from 0.1%to 5%by volume.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It
4、 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 st
5、andard-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:2D1298 Test Method for Density,Relative Density,
6、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
7、 andPetroleum ProductsD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD5769 Test Method for Determination of Benzene,Toluene,and Total Aromatics in Finished Gasolines by GasChromatography/Mass SpectrometryD5842 Practice for Sampling and Handling of Fuels forVolatility M
8、easurementD5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum ProductsE168 Practices for General Techniques of Infrared Quanti-tative AnalysisE1655 Practices for Infrared Multivariate QuantitativeAnalysisE2056 Practice for Qualifying Spectrometers and Spectro-photomete
9、rs for Use in Multivariate Analyses,CalibratedUsing Surrogate Mixtures3.Terminology3.1 Definitions:3.1.1 multivariate calibration,na process for creating acalibration model in which multivariate mathematics is appliedto correlate the absorbances measured for a set of calibrationsamples to reference
10、component concentrations or propertyvalues for the set of samples.3.1.1.1 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.3.1.1.2 DiscussionInc
11、luded in the multivariate calibrationalgorithms are Partial Least Squares,Multilinear Regression,and Classical Least Squares Peak Fitting.3.1.2 oxygenate,nan oxygen-containing organic com-pound which may be used as a fuel or fuel supplement,forexample,various alcohols and ethers.4.Summary of Test Me
12、thod4.1 Asample of spark-ignition engine fuel is introduced intoa liquid sample cell.Abeam of infrared light is imaged throughthe sample onto a detector,and the detector response isdetermined.Wavelengths of the spectrum,that correlate highlywith benzene or interferences,are selected for analysis usi
13、ngselective bandpass filters or by mathematically selecting areasof the whole spectrum.A multivariate mathematical analysisconverts the detector response for the selected areas of thespectrum of an unknown to a concentration of benzene.1This test method is under the jurisdiction of ASTM Committee D0
14、2 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.04.0F on Absorption Spectroscopic Methods.Current edition approved May 1,2022.Published May 2022.Originallyapproved in 1998.Last previous edition approved in 2017 as D6277 07(2017).DOI:10.1520/D627
15、7-07R22.2For 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
16、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.15.Significance and Use5.1 Benzene is a compound that endangers health,and theconcentration is limited by environmental protection agenc
