ASTM_D_7675_-_22.pdf

Designation:D767522Standard Test Method forDetermination of Total Hydrocarbons in Hydrogen by FID-Based Total Hydrocarbon(THC)Analyzer1This standard is issued under the fixed designation D7675;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 describes a procedure for total hydro-carbons(THCs)measurement in hydrogen intended as a fuelon a methane(C1)basis.The determination of THC on a C1basis is an analytical technique where all the hydrocarbons areassumed to have the same response as methane(CH4).Sensi-tivity from 0.1 parts per million by volume(ppm(v),mol/mol)up to 1000 ppm(v)concentration is achievable.Higher con-centrations can be analyzed using appropriate dilution tech-niques.This test method can be applied to other gaseoussamples requiring analysis of trace constituents provided anassessment of potential interferences has been accomplished.1.2 This test method is a Flame Ionization Detector-based(FID-based)hydrocarbon analysis method without the use ofseparation columns.Therefore,this method does not providespeciation of individual hydrocarbons.Several varieties ofinstruments are manufactured and can be used for this method.1.2.1 This method provides a measure of THC“as CH4,”because all hydrocarbon species are quantified the same as CH4response,which is the sole species used for calibration.Magnitude of the FID response to an atom of carbon isdependent on the chemical environment of this atom in themolecule.This method provides the THC result as if all carbonatoms are from aliphatic,aromatic,olefinic,or acetyleniccompounds,where the detector response caused by these atomsis approximately relative to the number of carbon atomspresent in the molecule.Other types of molecules,includingthose containing oxygen or chlorine atoms,will responddifferently and usually much lower than the correspondingaliphatic hydrocarbon.Therefore,other methods(Test MethodsD7653,D7892,or equivalent)must be utilized to determine theexact constituents of the THC response determined by thismethod.1.3 The proper handling of compressed gas cylinders con-taining air,nitrogen,hydrogen,or helium requires the use ofgas regulators to preclude over-pressurization of any instru-ment component1.4 UnitsThe values stated in SI units are to be regardedas standard.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,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:2D4150 Terminology Relating to Gaseous FuelsD7653 Test Method for Determination of Trace GaseousContaminants in Hydrogen Fuel by Fourier TransformInfrared(FTIR)SpectroscopyD7606 Practice for Sampling of High Pressure Hydrogenand Related Fuel Cell Feed GasesD7892 Test Method for Determination of Total OrganicHalides,Total Non-Methane Hydrocarbons,and Formal-dehyde in Hydrogen Fuel by Gas Chromatography/MassSpectrometry2.2 EPA Standard:340 CFR Part 136 Appendix B:Definition and Procedure forthe Determination of the Method Detection Limit1This test method is under the jurisdiction ofASTM Committee D03 on GaseousFuels and is the direct responsibility of Subcommittee D03.14 on Hydrogen andFuel Cells.Current edition approved June 1,2022.Published June 2022.Originallyapproved in 2011.Last previous edition approved in 2015 as D7675 15.DOI:10.1520/D7675-22.2For 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.3Available from United States Environmental ProtectionAgency(EPA),WilliamJefferson Clinton Bldg.,1200 Pennsylvania Ave.,NW,Washington,DC 20460,http:/www.epa.gov.Copyright 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.12.3 SAE Standard:4SAE J2719 Hydrogen Fuel Quality for Fuel Cell Ve