ASTM_D_5986_-_96_2015.pdf

Designation:D598696(Reapproved 2015)Standard Test Method forDetermination of Oxygenates,Benzene,Toluene,C8C12Aromatics and Total Aromatics in Finished Gasoline by GasChromatography/Fourier Transform Infrared Spectroscopy1This standard is issued under the fixed designation D5986;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 quantitative determinationof oxygenates:methyl-t-butylether(MTBE),di-isopropyl ether(DIPE),ethyl-t-butylether(ETBE),t-amylmethyl ether(TAME),methanol(MeOH),ethanol(EtOH),2-propanol(2-PrOH),t-butanol(t-BuOH),1-propanol(1-PrOH),2-butanol(2-BuOH),i-butanol(i-BuOH),1-butanol(1-BuOH);benzene,toluene and C8C12aromatics,and total aromatics in finishedmotor gasoline by gas chromatography/Fourier Transforminfrared spectroscopy(GC/FTIR).1.2 This test method covers the following concentrationranges:0.1 volume%to 20 volume%per component forethers and alcohols;0.1 volume%to 2 volume%benzene;1 volume%to 15 volume%for toluene,10 volume%to40 volume%total(C6C12)aromatics.1.3 The method has not been tested by ASTM for refineryindividual hydrocarbon process streams,such as reformates,fluid catalytic cracking naphthas,etc.,used in blending ofgasolines.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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:2D1298 Test Method for Density,Relative Density,or APIGravity of Crude Petroleum and Liquid Petroleum Prod-ucts by Hydrometer MethodD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4307 Practice for Preparation of Liquid Blends for Use asAnalytical Standards3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 aromaticsrefers to any organic compound contain-ing a benzene or naphthalene ring.3.1.2 calibrated aromatic componentin this test method,refers to the individual aromatic components which have aspecific calibration.3.1.3 cool on-column injectorin gas chromatography,adirect sample introduction system which is set at a temperatureat or below the boiling point of solutes or solvent on injectionand then heated at a rate equal to or greater than the column.Normally used to eliminate boiling point discrimination oninjection or to reduce adsorption,or both,on glass liners withininjectors.The sample is injected directly into the head of thecapillary column tubing or retention gap.3.1.4 Gram-Schmidt chromatograma nonselective sum-mation of total intensity from a spectral scan per unit timewhich resembles in profile a flame ionization detector chro-matogram.3.1.5 retention gapin gas chromatography,refers to adeactivated precolumn which acts as a zone of low retentionpower for reconcentrating bands in space.The polarity of theprecolumn must be similar to that of the analytical column.3.1.6 selective wavelength chromatogram(SWC)in thistest method,refers to a selective chromatogram obtained bysumming the spectral intensity in a narrow spectral wavelengthor frequency range as a function of elution time which isunique to the compound being quantitated.3.1.7 uncalibrated aromatic componentin this testmethod,refers to individual aromatics for which a calibration is1This 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 Oct.15,2015.Published December 2015.Originallyapproved in 1996.Last previous edition approved in 2011 as D5986 96(2011).DOI:10.1520/D5986-96R15.2For 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 not available and whose concentrations are estimated from theresponse factor of a calibrated aromatic component.3.1.8 wall coated open tubular(WCOT)a type of capillarycolumn prepared by coating or bonding the inside wall of thecapillary with a thin film of stationary phase.4.Summary of Test Method4.1 A gas chromatograph equipped with a methylsiliconeWCOT column is interfaced to a Fourier transform infraredspectrometer.The sample is injected through a cool on-col