ASTM_D_7920_-_15e1.pdf

Designation:D7920151Standard Test Method forDetermination of Fuel Methanol(M99)and Methanol FuelBlends(M10 to M99)by Gas Chromatography1This standard is issued under the fixed designation D7920;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.1NOTESection 16 was corrected editorially in September 2015.1.Scope1.1 This test method covers the determination of the metha-nol content,by gas chromatography,of M10 to M99 inmethanol fuel blends,including fuel methanol(M99).1.1.1 Methanol may be determined from 10%to 99%byvolume.1.2 This test method is designed to measure not onlymethanol in the blended gasoline but also the impurities in fuelmethanol(M99)itself in the range of 5 mg/kg to 1000 mg/kg.However,not all impurities are measured nor detected by thistest method.1.2.1 Water cannot be determined by this test method andshall be measured by a procedure such as Test Method D1364and the result used to correct the concentrations determined bythis test method.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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:2D1364 Test Method for Water in Volatile Solvents(KarlFischer Reagent Titration Method)D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD4814 Specification for Automotive Spark-Ignition EngineFuelD4626 Practice for Calculation of Gas ChromatographicResponse FactorsD5797 Specification for Fuel Methanol(M70-M85)for Au-tomotive Spark-Ignition EnginesD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE355 Practice for Gas Chromatography Terms and Relation-shipsE594 Practice for Testing Flame Ionization Detectors Usedin Gas or Supercritical Fluid ChromatographyE1064 Test Method for Water in Organic Liquids by Coulo-metric Karl Fischer TitrationE1510 Practice for Installing Fused Silica Open TubularCapillary Columns in Gas Chromatographs3.Terminology3.1 This test method makes reference to many commonchromatographic procedures,terms,and relationships.Detaileddefinitions can be found in Terminology D4175 and PracticesD4626,E355,and E594.3.2 Definitions:3.2.1 analyte,na specific compound to be measuredquantitatively in a mixture of compounds.3.2.2 analytical column,na chromatographic column usedto further separate a specific analyte from a mixture ofcompounds which can coelute in the primary column.3.2.3 analytical detector,na device used to quantify thecompounds of interest after they elute from the analyticalcolumn.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 Aug.1,2015.Published September 2015.DOI:10.1520/D7920-15E01.2For 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 3.2.4 fuel methanol(M99),nmethyl alcohol produced forthe purpose of blending with gasoline to make a fuel forspark-ignition internal combustion engines.3.2.4.1 DiscussionFuel methanol is typically producedwith 99%by volume methyl alcohol.3.2.5 gasoline,navolatilemixtureofliquidhydrocarbons,generally containing small amounts ofadditives,suitable for use as a fuel in spark-ignition internalcombustion engines.D48143.2.6 heart-cut,nin gas chromatography,a procedure inwhich the analyte in question is transferred from one column toa different column,usually of the opposite polarity.3.2.7 internal standard(IS),na high purity compound notpresent in the sample which is added to the sample and used tocalculate quantitatively the component of interest.3.2.7.1 DiscussionThe internal standard is added in aconstant amount to all calibration standards,see 7.4.2.1.3.2.8 mass response factor(MRF),na constant of propor-tionality that converts area percent to mass percent.3.2.9 methanol,nmethyl alcohol,the chemical compoundCH3OH