ASTM_D_6296_-_22.pdf

Designation:D629622Standard 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 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 provides for the quantitative determi-nation of total olefins in the C4to C10range in spark-ignitionengine fuels or related hydrocarbon streams,such as naphthasand cracked naphthas.Olefin concentrations in the range from0.2%by liquid-volume or mass to 5.0%by liquid-volume ormass,or both,can be determined directly on the as-receivedsample whereas olefins in samples containing higher 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%or 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.NOTE1Precision 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 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.1.7 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:2D1319 Test Method for Hydrocarbon Types in Liquid Petro-leum Products by Fluorescent Indicator AdsorptionD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD4815 Test Method for Determination of MTBE,ETBE,TAME,DIPE,tertiary-Amyl Alcohol and C1to C4Alco-hols in Gasoline by Gas ChromatographyD5599 Test Method for Determination of Oxygenates inGasoline by Gas Chromatography and Oxygen SelectiveFlame Ionization DetectionE355 Practice for Gas Chromatography Terms and Relation-shipsE594 Practice for Testing Flame Ionization Detectors Usedin Gas or Supercritical Fluid Chromatography3.Terminology3.1 This test method makes reference to common gaschromatographic procedures,terms,and relationships.Detaileddefinitions of these can be found in Practices E355 and E594and Terminology D4175.3.2 Definitions of Terms Specific to This Standard:3.2.1 trap,na device utilized to selectively retain specificportions(individual or groups of hydrocarbons or oxygenates)of the test sample and to release the retained components byincreasing the trap temperature.3.3 Acronyms:3.3.1 ETBEethyl-tert-butylether.3.3.2 MTBEmethyl-tertbutylether.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricantsand is the direct responsibility ofSubcommittee D02.04.0L on Gas Chromatography Methods.Current edition approved April 1,2022.Published May 2022.Originallyapproved in 1998.Last previous edition approved in 2017 as D6296 98(2017).DOI:10.1520/D6296-22.2For 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.*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 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.14.Summary of Test Method4.1 A reproducible 0.2 L volume of a representativesample,or a dilution thereof,is introduced into a computercontrolled gas chromatographic system3consisting of a seriesof columns,traps,and switching valves operating at varioustemp