1、Designation:D 6293 98(Reapproved 2003)e1An American National StandardStandard Test Method forOxygenates and Paraffin,Olefin,Naphthene,Aromatic(O-PONA)Hydrocarbon Types in Low-Olefin Spark IgnitionEngine Fuels by Gas Chromatography1This standard is issued under the fixed designation D 6293;the number
2、 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(e)indicates an editorial change since the last revision or reapproval.e1NOTEWarning no
3、tes were editorially moved into the standard text in August 2003.1.Scope1.1 This test method provides for the quantitative determi-nation of oxygenates,paraffins,olefins,naphthenes,and aro-matics in low-olefin spark-ignition engine fuels by multidimen-sional gas chromatography.Each hydrocarbon type
4、can bereported either by carbon number(see Note 1)or as a totalthrough C10,except for olefins,which can only be reportedthrough C9.Higher boiling hydrocarbons cannot be reported bytype and are reported as a composite group.The lower limit ofdetection for a single hydrocarbon component or carbonnumbe
5、r type is 0.05 mass%.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.Naphthalene isdetermined with the C11+components.1.2 This test method is applicable for total o
6、lefins in therange from 0.05 to 13 mass%.The test method can quantita-tively determine olefins in samples where the olefin concen-tration does not exceed 0.6%C4or 4.0%C5or 4.5%of thecombined C4and C5.Although the precision for benzene wasdetermined in the range from 0.3 to 1.0 mass%,this testmethod
7、can be used to determine benzene concentrations up to5.0 mass%.1.3 This test method is not intended to determine individualhydrocarbon components except for those hydrocarbon typesfor which there is only one component within a carbon number.Individually determined hydrocarbons are benzene,toluene,cy
8、clopentane,propane,propylene,and cyclopentene.1.4 Precision data has only been obtained on samplescontaining MTBE.Application of this test method to determineother oxygenates shall be verified in the users laboratory.Methanol cannot be determined and shall be quantitated by anappropriate oxygenate m
9、ethod such as Test Method D 4815 orD 5599.Methanol is fully resolved and does not interfere withthe determination of other components or groups.1.5 Although specifically written for spark-ignition enginefuels containing oxygenates,this test method can also beapplied to other hydrocarbon streams havi
10、ng similar boilingranges,such as naphthas and reformates.1.6 The values stated in SI units are to be regarded as thestandard.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-
11、priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D 4307 Practice for Preparation of Liquid Blends for UseAs Analytical Standards2D 4815 Test Method for Determination of MTBE,ETBE,TAME,DIPE tertiary-Amy
12、l Alcohol and C1to C4Alco-hols in Gasoline by Gas Chromatography2D 5599 Test Method for Determination of Oxygenates inGasoline by Gas Chromatography and Oxygen SelectiveFlame Ionization Detection33.Terminology3.1 Definitions:3.1.1 oxygenate,nan oxygen-containing organic com-pound,which may be used a
13、s 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 c
14、ontact platinum at a temperature of180C in the presence of hydrogen.The olefins are converted1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.04 on Hydrocarbon Analysis.Current edition approved M
15、ay 10,2003.Published August 2003.Originallyapproved in 1998.Last previous edition approved in 1998 as D 629398.2Annual Book of ASTM Standards,Vol 05.02.3Annual Book of ASTM Standards,Vol 05.03.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United Stat
16、es.into 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)of the test sample and to release the retained components bychanging the trap temperature.3.3 Acronyms:3.3.1 ETBE,ethyl-tert-butylether.3.3.2 MTBE,methyl-tert-butylether.3.3.3 TAME,tert-amyl-methyl
