1、Designation:D518615Standard Test Method forDetermination of the Aromatic Content and PolynuclearAromatic Content of Diesel Fuels and Aviation Turbine FuelsBy Supercritical Fluid Chromatography1This standard is issued under the fixed designation D5186;the number immediately following the designation
2、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.Scope*1.1 This test method covers the determination of
3、 the totalamounts of monoaromatic and polynuclear aromatic hydrocar-bon compounds in motor diesel fuels,aviation turbine fuels,and blend stocks by supercritical fluid chromatography(SFC).The range of aromatics concentration to which this test methodis applicable is from 1 to 75 mass%.The range of po
4、lynucleararomatic hydrocarbon concentrations to which this test methodis applicable is from 0.5 to 50 mass%.1.2 The values stated in SI units are to be regarded asstandard.The values stated in inch-pound units are for infor-mation only.1.3 This standard does not purport to address all of thesafety c
5、oncerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1319 Test Method for Hydrocarbon Types
6、in Liquid Petro-leum Products by Fluorescent Indicator AdsorptionD1655 Specification for Aviation Turbine FuelsD2425 Test Method for Hydrocarbon Types in Middle Dis-tillates by Mass SpectrometryD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate Analy
7、ticalMeasurement System Performance3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 critical pressure,nthat pressure needed to condensea gas at the critical temperature.3.1.2 critical temperature,nthe highest temperature atwhich a gaseous fluid may be converted to a liquid by me
8、ansof compression.3.1.3 mononuclear aromatic hydrocarbons,nhydrocarbon compounds containing exactly one aromaticring.This group includes benzene,alkyl-substituted benzenes,indans,tetralins,alkyl-substituted indans,and alkyl-substitutedtetralins.3.1.4 polynuclear aromatic hydrocarbons,nall hydrocar-b
9、on compounds containing two or more aromatic rings.Theserings may be fused as in naphthalene and phenanthrene,orseparate as in biphenyl.3.1.5 restrictor,na device,attached to the outlet of achromatographic column,to restrict the mobile phase flowsuch that the mobile phase is maintained in the superc
10、riticalstate throughout the chromatographic column.3.1.6 supercritical fluid,na fluid maintained in a thermo-dynamic state above its critical temperature and critical pres-sure.3.1.7 supercritical fluid chromatography,na class of chro-matography that employs supercritical fluids as mobile phases.4.S
11、ummary of Test Method4.1 A small aliquot of the fuel sample is injected onto apacked silica adsorption column and eluted using supercriticalcarbon dioxide mobile phase.Monoaromatics and polynucleararomatics in the sample are separated from nonaromatics anddetected using a flame ionization detector.4
12、.2 The detector response to hydrocarbons is recordedthroughout the analysis time.The chromatographic areascorresponding to the monoaromatic,polynuclear aromatic,andnonaromatic components are determined and the mass%content of each of these groups in the fuel is calculated by areanormalization.5.Sign
13、ificance and Use5.1 The aromatic hydrocarbon content of motor diesel fuelsis a factor that can affect their cetane number and exhaust1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.
14、04.0C on Liquid Chromatography.Current edition approved April 1,2015.Published June 2015.Originallyapproved in 1991.Last previous edition approved in 2009 as D5186 03(2009).DOI:10.1520/D5186-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serv
15、iceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United State
16、s1 emissions.The aromatic hydrocarbon content and the naphtha-lenes content of aviation turbine fuels affect their combustioncharacteristics and smoke-forming tendencies.These proper-ties represent specifications for aviation turbine fuels(seeSpecification D1655).5.2 The United States Environmental Protection Agency(USEPA)regulates the aromatic content of diesel fuels.Cali-forniaAir Resources Board(CARB)regulations place limits onthe total aromatics content and polynuclear aromatic hydrocar-bon
