ASTM_D_7753_-_12.pdf

Designation:D775312Standard Test Method forHydrocarbon Types and Benzene in Light PetroleumDistillates by Gas Chromatography1This standard is issued under the fixed designation D7753;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 and provides for the quantita-tive determination of total saturates,total olefins,total aromat-ics and benzene in light petroleum distillates having a finalboiling point below 215C by multidimensional gas chroma-tography.Each hydrocarbon grouping as well as benzene canbe reported in both volume and mass percent.1.2 This test method is applicable to light petroleum distil-lates such as oxygenate-free motor gasoline or spark ignitionfuels,naphthas and hydrocarbon solvents over the contentranges from 1%(V/V)to 70%(V/V)total olefins,1%(V/V)to 80%(V/V)total aromatics and 0.2 to 10%(V/V)benzene.This test method may apply to concentrations outside theseranges,but the precision has not been determined.Interlabo-ratory testing for precision used full range blending streams,such as FCC,reformates and spark ignition fuel or blendedmotor gasolines.1.3 This test method is not intended to determine oxygen-ated components.Light petroleum distillate products such asmotor gasoline may contain oxygenates.Oxygenates such asmethyl tert-butyl ether(MTBE),tert-amyl methyl ether(TAME),ethyl tert-butyl ether(ETBE),ethanol and methanoletc.will coelute with specific hydrocarbon groups.If there isany suspicion the sample contains oxygenates,the absence ofoxygenates should be confirmed by other standard test methodssuch as Test Methods D4815,D5599,or D6839 before usingthis test method.1.4 This test method is not applicable for the determinationof individual hydrocarbon components with the exception ofbenzene.Test Method D6733 may be used to determine a largenumber of individual hydrocarbons to complement this testmethod.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 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:2D4815 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 DetectionD6733 Test Method for Determination of Individual Com-ponents in Spark Ignition Engine Fuels by 50-MetreCapillary High Resolution Gas ChromatographyD6839 Test Method for Hydrocarbon Types,OxygenatedCompounds,and Benzene in Spark Ignition Engine Fuelsby Gas Chromatography3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 aromatics,nmass or volume%of monocyclicaromaticsandpolycyclicaromatics(forexample,naphthalenes),aromatic olefins and C8+cyclodienes com-pounds.3.1.2 C7+aromatics,nmass or volume%of all otheraromatics compounds(see 3.1.1)in sample not includingbenzene.3.1.3 olefins,nmass or volume%of alkenes,plus cy-cloalkenes and some di-olefins.3.1.4 olefins trap,nspecific column utilized to selectivelyretain olefins from mixture of olefins and saturates.The trapmust have good reversibility to capture and release olefins bychanging the temperature.3.2 Acronyms: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 Jan.15,2012.Published July 2012.DOI:10.1520/D7753-12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.1 BCEF-N,N-bis(-cyanoethyl)formamidegas chro-matography stationary phase.4.Summary of Test Method4.1 Fig.1 shows a separation scheme of the various hydro-carbon types and benzene analysis.The instrumental configu-ration is shown in Fig.2.The valves are actuated at predeter-mined times to direct different components to differentcolumns.As the analysis proceeds,different hydrocarbon typesand benzene elute and are detected by a flame ionizationdetector(FID).4.2 The mass concentration of different hydrocarbon typesand benzene are determined by the application of averagerelative response factors to the areas of the detected peaksfollo