ASTM_D_5622_-_17.pdf

Designation:D562217Standard Test Methods forDetermination of Total Oxygen in Gasoline and MethanolFuels by Reductive Pyrolysis1This standard is issued under the fixed designation D5622;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 These test methods cover the quantitative determinationof total oxygen in gasoline and methanol fuels by reductivepyrolysis.1.2 Precision data are provided for 1.0%to 5.0%oxygenby mass in gasoline and for 40%to 50%oxygen by mass inmethanol fuels.1.3 Several types of instruments can be satisfactory forthese test methods.Instruments can differ in the way that theoxygen-containing species is detected and quantitated.However,these test methods are similar in that the fuel ispyrolyzed in a carbon-rich environment.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.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: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 ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4815 Test Method for Determination of MTBE,ETBE,TAME,DIPE,tertiary-Amyl Alcohol and C1to C4Alco-hols in Gasoline by Gas Chromatography2.2 Other Standards:Clean Air Act(1992)33.Summary of Test Method3.1 A fuel specimen of 1 L to 10 L is injected by syringeinto a 950 C to 1300 C high-temperature tube furnace thatcontains metallized carbon.Oxygen-containing compounds arepyrolyzed,and the oxygen is quantitatively converted intocarbon monoxide.3.2 A carrier gas,such as nitrogen,helium,or a helium/hydrogen mixture,sweeps the pyrolysis gases into any of fourdownstream systems of reactors,scrubbers,separators,anddetectors for the determination of the carbon monoxidecontent,hence of the oxygen in the original fuel sample.Theresult is reported as mass%oxygen in the fuel.4.Significance and Use4.1 These test methods cover the determination of totaloxygen in gasoline and methanol fuels,and they complementTest Method D4815,which covers the determination of severalspecific oxygen-containing compounds in gasoline.4.2 The presence of oxygen-containing compounds in gaso-line can promote more complete combustion,which reducescarbon monoxide emissions.The CleanAirAct(1992)requiresthat gasoline sold within certain specified geographical areascontain a minimum percent of oxygen by mass(presently2.7 mass%)during certain portions of the year.The require-ment can be met by blending compounds such as methyltertiary butyl ether,ethyl tertiary butyl ether,and ethanol into1These test methods are under the jurisdiction of Committee D02 on PetroleumProducts,Liquid Fuels,and Lubricants and are the direct responsibility ofSubcommittee D02.03 on Elemental Analysis.Current edition approved May 1,2017.Published May 2017.Originallyapproved in 1994.Last previous edition approved in 2016 as D5622 16.DOI:10.1520/D5622-17.2For 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.3Federal Register,Vol 57,No.24,Feb.5,1992,p.4408.*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 the gasoline.These test methods cover the quantitative deter-mination of total oxygen which is the regulated parameter.4.2.1 Only seven U.S.states have such wintertimerequirements,and others with EPA approval have opted out ofthe program.The minimum oxygen limit now varies