ASTM_D_7059_-_21.pdf

Designation:D705921Standard Test Method forDetermination of Methanol in Crude Oils byMultidimensional Gas Chromatography1This standard is issued under the fixed designation D7059;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.Scope*1.1 This test method covers the determination of methanolin crude oils by direct injection multidimensional gas chroma-tography in the concentration range of 15 ppm(m/m)to900 ppm(m/m).The pooled limit of quantification(PLOQ)is15 ppm(m/m).1.2 This test method is applicable only to crude oils con-taining less than or equal to 0.1%(v/v)water.1.3 This test method has not been tested with crude oilsamples that are solid or waxy,or both,at ambient tempera-tures.1.4 The values stated in SI units are to be regarded asstandard.Alternate units,in common usage,are also providedto increase clarity and aid the users of this test method.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 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.2.Referenced Documents2.1 ASTM Standards:2D4006 Test Method for Water in Crude Oil by DistillationD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD4928 Test Method for Water in Crude Oils by CoulometricKarl Fischer TitrationD6596 Practice for Ampulization and Storage of Gasolineand Related Hydrocarbon MaterialsE355 Practice for Gas Chromatography Terms and Relation-shipsE594 Practice for Testing Flame Ionization Detectors Usedin Gas or Supercritical Fluid Chromatography3.Terminology3.1 Definitions:3.1.1 This test method makes reference to common gaschromatographic procedures,terms,and relationships.Detaileddefinitions of these can be found in Practices E355 and E594,and Terminology D4175.Additional definitions and informa-tion pertinent to this test method are listed below.3.1.2 analytical column,nporous layer open tubular(PLOT)column with a stationary phase selective for oxygen-ates;it is used to resolve methanol from 1-propanol to provideaccurate quantitative results.3.1.3 cool-on-column injector,nan injection port thatallows controlled injection of the sample at a temperature closeto or lower than the boiling point of the solvent into the gaschromatographic column or a liner within the injection portconnected to the column.3.1.3.1 DiscussionAfter the injection,the injection port isheated at a fixed rate to a temperature sufficiently high enoughto allow the transfer of sample components of interest from theinjection port to the part of the column located in the gaschromatograph(GC)oven.3.1.4 electronic pressure control,nelectronic pneumaticcontrol of carrier gas flows;it can be flow or pressureprogrammed to speed up elution of components.3.1.5 low-volume connector,na special union for connect-ing two lengths of tubing 1.6 mm inside diameter and smaller;sometimes referred to as a zero dead-volume union.3.1.6 pre-column,na polydimethylsiloxane WCOT col-umn used to isolate the methanol and 1-propanol and several1This 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 Dec.1,2021.Published December 2021.Originallyapproved in 2004.Last previous edition approved in 2017 as D7059 09(2017).DOI:10.1520/D7059-21.2For 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.*A Summary of Changes section appears at the end of this standardCopyright 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.1?light hydrocarbons from the higher boiling portion of the crudeoi