ASTM_D_7675_-_15.pdf

Designation:D767515Standard 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(THC)measurement in hydrogen intended as a fuel forfuel cells on a methane(C1)basis.The determination of totalhydrocarbons on a C1 basis is an analytical technique where allof the hydrocarbons are assumed to have the same response asmethane.Sensitivity from 0.1 part per million(ppm(v),mole/mole)up to 1000 parts per million(ppm(v),mole/mole)concentration are achievable.Higher concentrations can beanalyzed using appropriate dilution techniques.This testmethod can be applied to other gaseous samples requiringanalysis of trace constituents provided an assessment ofpotential interferences has been accomplished.1.2 This test method is an FID-based hydrocarbon analysismethod without the use of separation columns.Therefore,thismethod does not provide speciation of individual hydrocar-bons.Several varieties of instruments are manufactured andcan be used for this method.1.2.1 This method provides a measure of total hydrocarbons“as methane,”because all hydrocarbon species are quantifiedthe same as methane response,which is the sole species usedfor calibration.Magnitude of the FID response to an atom ofcarbon is dependent on the chemical environment of this atomin the molecule.This method provides the total hydrocarbonresult as if all carbon atoms are from aliphatic,aromatic,olefinic,or acetylenic compounds,where the detector responsecaused by these atoms are approximately relative to the numberof carbon atoms present in the molecule.Other types ofmolecules,including those containing oxygen or chlorineatoms will respond differently and usually much lower than thecorresponding aliphatic hydrocarbon.Therefore other methods(Test Methods D7653,D7892,or equivalent)must be utilizedto determine the exact constituents of the total hydrocarbonresponse determined by this method.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 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:2D7653 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 Standards:3EPA40 CRF Part 136 Appendix B:Definition and Procedurefor the Determination of the Method Detection Limit2.3 SAE Standards:4SAE J2719 Hydrogen Quality Guideline for Fuel Cell Ve-hicles3.Terminology3.1 Definitions of Terms Specific to This Standard:1This 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 Nov.1,2015.Published December 2015.Originallyapproved in 2011.Last previous edition approved in 2011 as D7675-11.DOI:10.1520/D767515.2For 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.4Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.1 C1 Hydrocarbon,na hydrocarbon carbon contentexpressed in terms of methane.3.1.2 C2 Hydrocarbon,na hydrocarbon carbon contentexpressed in terms of ethane.3.1.3 contaminant,nimpurity or foreign material thatmakes a product less suitable or even unsuitable for theintended use or that adversely affects the components withinthe processing,storage,or distribution systems.3.1.4 dynamic calibration,ncalibration of an analyticalsystem using ca