ASTM_D_6839_-_21a.pdf

Designation:D683921aStandard Test Method forHydrocarbon Types,Oxygenated Compounds,Benzene,andToluene in Spark Ignition Engine Fuels by MultidimensionalGas 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 not intended to determine individualhydrocarbon components except benzene and toluene.1.3 This test method is divided into two parts,Part A andPart B.1.3.1 Part A is applicable to the concentration ranges forwhich precision(Table 10 and Table 11)has been obtained:PropertyUnitsApplicable rangeTotal aromaticsVolume%19.32 to 46.29Total saturatesVolume%26.85 to 79.31Total olefinsVolume%0.40 to 26.85OxygenatesVolume%0.61 to 9.85Oxygen ContentMass%2.01 to 12.32BenzeneVolume%0.38 to 1.98TolueneVolume%5.85 to 31.65MethanolVolume%1.05 to 16.96EthanolVolume%0.50 to 17.86MTBEVolume%0.99 to 15.70ETBEVolume%0.99 to 15.49TAMEVolume%0.99 to 5.92TAEEVolume%0.98 to 15.591.3.1.1 This test method is specifically developed for theanalysisofautomotivemotorgasolinethatcontainsoxygenates,but it also applies to other hydrocarbon streamshaving similar boiling ranges,such as naphthas and reformates.1.3.2 Part B describes the procedure for the analysis ofoxygenated groups(ethanol,methanol,ethers,C3to C5alco-hols)in ethanol fuels containing an ethanol volume fractionbetween 50%and 85%(17%to 29%oxygen).The gasolineis diluted with an oxygenate-free component to lower theethanol content to a value below 20%before the analysis byGC.The diluting solvent should not be considered in theintegration,this makes it possible to report the results of theundiluted sample after normalization to 100%.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,TAME,iso-propanol,isobutanol,tert-butanol and methanol.Applicability of this testmethod has also been verified for the determination ofn-propanol,acetone,and di-isopropyl ether(DIPE).However,no precision data have been determined for these compounds.1.4.1 Other oxygenates can be determined and quantifiedusing Test Method D4815 or D5599.1.5 The method is harmonized with ISO 22854.1.6 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 D1319.1.7 This test method includes a relative bias section forreporting benzene based on Practice D6708 accuracy assess-ment between Test Method D6839 and Test Method D3606(Procedure B)as a possible Test Method D6839 alternative toTest Method D3606(Procedure B).The Practice D6708derived correlation equation is only applicable for fuels in thebenzene concentration range from 0.52%to 1.67%by volumeas measured by Test Method D6839.1.8 This test method includes a relative bias section forreporting benzene based on Practice D6708 accuracy assess-ment between Test Method D6839 and Test Method D5580 asa possible Test Method D6839 alternative to Test Method1This 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 May 1,2021.Published July 2021.Originally approvedin 2002.Last previous edition approved in 2021 as D6839 21.DOI:10.1520/D6839-21A.*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