ASTM_D_6733_-_01_2020.pdf

Designation:D673301(Reapproved 2020)Standard Test Method forDetermination of Individual Components in Spark IgnitionEngine Fuels by 50-Metre Capillary High Resolution GasChromatography1This standard is issued under the fixed designation D6733;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.Scope1.1 This test method covers the determination of individualhydrocarbon components of spark-ignition engine fuels withboiling ranges up to 225 C.Other light liquid hydrocarbonmixturestypicallyencounteredinpetroleumrefiningoperations,such as,blending stocks(naphthas,reformates,alkylates,and so forth)may also be analyzed;however,statistical data was obtained only with blended spark-ignitionengine fuels.The tables in Annex A1 enumerate the compo-nents reported.Component concentrations are determined inthe range from 0.10%to 15%by mass.The procedure may beapplicable to higher and lower concentrations for the individualcomponents;however,the user must verify the accuracy if theprocedures are used for components with concentrations out-side the specified ranges.1.2 This test method is applicable also to spark-ignitionengine fuel blends containing oxygenated components.However,in this case,the oxygenate content must be deter-mined by Test Methods D5599 or D4815.1.3 Benzene co-elutes with 1-methylcyclopentene.Benzenecontent must be determined by Test Method D3606 or D5580.1.4 Toluene co-elutes with 2,3,3-trimethylpentane.Toluenecontent must be determined by Test Method D3606 or D5580.1.5 Although a majority of the individual hydrocarbonspresent are determined,some co-elution of compounds isencountered.If this procedure is utilized to estimate bulkhydrocarbon group-type composition(PONA)the user of suchdata should be cautioned that error may be encountered due toco-elution and a lack of identification of all componentspresent.Samples containing significant amounts of naphthenic(for example,virgin naphthas)constituents above n-octanemay reflect significant errors in PONA type groupings.Basedon the interlaboratory cooperative study,this procedure isapplicable to samples having concentrations of olefins less than20%by mass.However,significant interfering coelution withthe olefins above C7is possible,particularly if blendingcomponents or their higher boiling cuts such as those derivedfrom fluid catalytic cracking(FCC)are analyzed,and the totalolefin content may not be accurate.Many of the olefins in sparkignition fuels are at a concentration below 0.10%;they are notreported by this test method and may bias the total olefinresults low.1.5.1 Total olefins in the samples may be obtained orconfirmed,or both,by Test Method D1319(volume%)orother test methods,such as those based on multidimensionalPONA type of instruments.1.6 If water is or is suspected of being present,its concen-tration may be determined,if desired,by the use of TestMethod D1744.Other compounds containing sulfur,nitrogen,and so forth,may also be present,and may co-elute with thehydrocarbons.If determination of these specific compounds isrequired,it is recommended that test methods for these specificmaterials be used,such as Test Method D5623 for sulfurcompounds.1.7 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are provided forinformation only.1.8 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.1.9 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.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 Nov.1,2020.Published November 2020.Originallyapproved in 2001.Last previous edition approved in 2016 as D6733 01(2016).DOI:10.1520/D6733-01R20.Copyright 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.12.Referenced Documents2.1 ASTM Standards:2D1319 Test M