ASTM_D_6730_-_01_2011.pdf

Designation:D673001(Reapproved 2011)Standard Test Method forDetermination of Individual Components in Spark IgnitionEngine Fuels by 100Metre Capillary(with Precolumn)High-Resolution Gas Chromatography1This standard is issued under the fixed designation D6730;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 andtheir mixtures containing oxygenate blends(MTBE,ETBE,ethanol,and so forth)with boiling ranges up to 225C.Otherlight liquid hydrocarbon mixtures typically encountered inpetroleum refining operations,such as blending stocks(naphthas,reformates,alkylates,and so forth)may also beanalyzed;however,statistical data was obtained only withblended spark-ignition engine fuels.1.2 Based on the cooperative study results,individual com-ponent concentrations and precision are determined in therange from 0.01 to approximately 30 mass%.The test methodmay be applicable to higher and lower concentrations for theindividual components;however,the user must verify theaccuracy if the test method is used for components withconcentrations outside the specified ranges.1.3 This test method also determines methanol,ethanol,t-butanol,methyl t-butyl ether(MTBE),ethyl t-butyl ether(ETBE),and t-amyl methyl ether(TAME)in spark ignitionengine fuels in the concentration range from 1 to 30 mass%.However,the cooperative study data provided insufficientstatistical data for obtaining a precision statement for thesecompounds.1.4 Although a majority of the individual hydrocarbonspresent are determined,some co-elution of compounds isencountered.If this test method is utilized to estimate bulkhydrocarbon group-type composition(PONA),the user of suchdata should be cautioned that some error will be encountereddue to co-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 gasoline samples in the interlaboratory cooperativestudy,this test method is applicable to samples containing lessthan 25 mass%of olefins.However,some interfering co-elution with the olefins above C7is possible,particularly ifblending components or their higher boiling cuts such as thosederived from fluid catalytic cracking(FCC)are analyzed,andthe total olefin content may not be accurate.Annex A1 of thistest method compares results of the test method with other testmethods for selected components,including olefins,and sev-eral group types for several interlaboratory cooperative studysamples.Although benzene,toulene,and several oxygenatesare determined,when doubtful as to the analytical results ofthese components,confirmatory analyses can be obtained byusing the specific test methods listed in the reference section.1.4.1 Total olefins in the samples may be obtained orconfirmed,or both,if necessary,by Test Method D1319(volume%)or other test methods,such as those based onmultidimentional PONA-type of instruments.1.5 If water is or is suspected of being present,its concen-tration may be determined,if desired,by the use of TestMethod D1744 or equivalent.Other compounds containingoxygen,sulfur,nitrogen,and so forth,may also be present,andmay co-elute with the hydrocarbons.If determination of thesespecific compounds is required,it is recommended that testmethods for these specific materials be used,such as TestMethods D4815 and D5599 for oxygenates,and Test MethodD5623 for sulfur compounds,or equivalent.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.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 May 1,2011.Published May 2011.Originallyapproved in 2001.Last previous edition approved in 2006 as D6730 01(2006)1.DOI:10.1520/D6730-01R11.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 2.Referenced Documents2.1 ASTM Standards:2D1319 Test Method for Hydrocarbon Types in Liquid Petro-leum Products by Fluorescent Indicator AdsorptionD1744 Test Method for Determination of Water in LiquidPetroleum Products by Karl Fischer ReagentD3700 Practice for Obtaining LPG Samples Usin