1、Designation:D629698(Reapproved 2017)Standard Test Method forTotal Olefins in Spark-ignition Engine Fuels byMultidimensional Gas Chromatography1This standard is issued under the fixed designation D6296;the number immediately following the designation indicates the year oforiginal adoption or,in the c
2、ase 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 provides for the quantitative determi-nation of total olefins in the C4to C10r
3、ange in spark-ignitionengine fuels or related hydrocarbon streams,such as naphthasand cracked naphthas.Olefin concentrations in the range from0.2 liquid-volume%or mass%to 5.0 liquid-volume%ormass%,or both,can be determined directly on the as-receivedsample whereas olefins in samples containing highe
4、r concen-trations are determined after appropriate sample dilution priorto analysis.1.2 This test method is applicable to samples containingalcohols and ethers;however,samples containing greater than15%alcohol must be diluted.Samples containing greater than5.0%ether must also be diluted to the 5.0%o
5、r less level,priorto analysis.When ethyl-tert-butylether is present,only olefinsin the C4to C9range can be determined.1.3 This test method can not be used to determine individualolefin components.1.4 This test method can not be used to determine olefinshaving higher carbon numbers than C10.NOTE1Prec
6、ision was determined only on samples containing MTBEand ethanol.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is ther
7、esponsibility 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.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-i
8、zation 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:2D1319 Test Method for Hydrocarbon Types in Liquid Petro
9、-leum Products by Fluorescent Indicator AdsorptionD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD4815 Test Method for Determination of MTBE,ETBE,TAME,DIPE,tertiary-Amyl Al
10、cohol and C1to C4Alco-hols in Gasoline by Gas ChromatographyD5599 Test Method for Determination of Oxygenates inGasoline by Gas Chromatography and Oxygen SelectiveFlame Ionization Detection3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 trap,na device utilized to selectively re
11、tain specificportions(individual or groups of hydrocarbons or oxygenates)of the test sample and to release the retained components byincreasing the trap temperature.3.2 Acronyms:3.2.1 ETBEethyl-tert-butylether.3.2.2 MTBEmethyl-tertbutylether.4.Summary of Test Method4.1 A reproducible 0.2 L volume of
12、 a representativesample,or a dilution thereof,is introduced into a computercontrolled gas chromatographic system3consisting of a seriesof columns,traps,and switching valves operating at various1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lub
13、ricantsand is the direct responsibility ofSubcommittee D02.04.0L on Gas Chromatography Methods.Current edition approved Oct.1,2017.Published November 2017.Originallyapproved in 1998.Last previous edition approved in 2013 as D6296 98(2013).DOI:10.1520/D6296-98R17.2For referenced ASTM standards,visit
14、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.3The sole source of supply of apparatus known to the committee at this time,theAC FTO Analyzer,is AC An
15、alytical Controls,Inc.,3494 Progress Dr.,Bensalem,PA 19020.If you are aware of alternative suppliers,please provide this informationto ASTM Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.Copyright ASTM Internatio
16、nal,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.1 temperatures.The valves are actuated at predetermined timesto direct portions of the sample to approp
