ASTM_D_6839_-_15.pdf

Designation:D683915Standard Test Method forHydrocarbon Types,Oxygenated Compounds and Benzenein Spark Ignition Engine Fuels by Gas Chromatography1This standard is issued under the fixed designation D6839;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 covers the quantitative determinationof saturates,olefins,aromatics and oxygenates in spark-ignition engine fuels by multidimensional gas chromatography.Each hydrocarbon type can be reported either by carbonnumber(see Note 1)or as a total.NOTE1There can be an overlap between the C9and C10aromatics;however,the total is accurate.Isopropyl benzene is resolved from the C8aromatics and is included with the other C9aromatics.1.2 This test method is applicable to spark-ignition enginefuel with total aromatic content up to 50%(V/V),total olefiniccontent up to 30%(V/V)and oxygen compounds up to 15%(V/V).1.3 This test method is not intended to determine individualhydrocarbon components except benzene.1.4 Oxygenates as specified in Test Method D4815 havebeen verified not to interfere with hydrocarbons.Within theround robin sample set,the following oxygenates have beentested:MTBE,ethanol,ETBE,and TAME.Other oxygenatescan be determined and quantified using Test Method D4815 orD5599.1.5 This test method includes a relative bias section for U.S.EPA spark-ignition engine fuel regulations for total olefinsreporting based on Practice D6708 accuracy assessment be-tween Test Method D6839 and Test Method D1319 as apossible Test Method D6839 alternative to Test MethodD1319.The Practice D6708 derived correlation equation isonly applicable for fuels in the total olefins concentration rangefrom 0.2%to 18.2%by volume as measured by Test MethodD6839.The applicable Test Method D1319 range for totalolefins is from 0.6%to 20.6%by volume as reported by TestMethod D1319.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 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 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 in Liquid Petro-leum Products by Fluorescent Indicator AdsorptionD4307 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 DetectionD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a Material3.Terminology3.1 Definitions:3.1.1 oxygenate,nanoxygen-containingorganiccompound,which may be used as a fuel or fuel supplement,forexample,various alcohols and ethers.3.2 Definitions of Terms Specific to This Standard:3.2.1 hydrogenation,nthe process of adding hydrogen toolefin molecules as a result of a catalytic reaction.3.2.1.1 DiscussionHydrogenation is accomplished whenolefins in the sample contact platinum at a temperature of180 C in the presence of hydrogen.The olefins are convertedinto hydrogen saturated compounds of the same carbon numberand structure.Monoolefins and diolefins convert to paraffinswhile cycloolefins and cyclodienes convert to cycloparaffins.3.2.2 trap,na device utilized to selectively retain specificportions(individual or groups of hydrocarbons or oxygenates)1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.04.0L on Gas Chromatography Methods.Current edition approved Dec.1,2015.Published December 2015.Originallyapproved in 2002.Last previous edition approved in 2013 as D6839 13.DOI:10.1520/D6839-15.2For 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 States1 of the test sample and to release the retained components bychanging the trap temperature.3.3 Acronyms:3.3.1 ETBEethyl-tert-butylether3.3.2 MTBEmethyl-tert-butylether3.3.3 TAMEtert-amyl-methylether4.Summary of Test Method4.1 A representative sample is introduced into a computercontrolled gas