ASTM D7675-22

Standard Test Method for Determination of Total Hydrocarbons in Hydrogen by FID-Based Total Hydrocarbon (THC) Analyzer

SIGNIFICANCE AND USE
5.1 Low operating temperature fuel cells such as proton exchange membrane fuel cells (PEM-FC) require high purity hydrogen for maximum material performance and lifetime. Analysis to 0.1 part per million (ppm(v)) concentration of THCs (measured as CH4) in hydrogen is necessary for ensuring a feed gas of sufficient purity to satisfy fuel cell system needs as defined in SAE J2719 or as specified in regulatory codes.  
5.2 Dynamic dilution techniques using highly accurate mass flow controllers can be used with test samples that have THC content exceeding the upper limit of the instrument’s linear range, without the need to recalibrate the instrument using higher levels of calibration standards. The sample can be diluted with a high purity grade of hydrogen (99.999 %, so long as it contains  
5.3 Although not intended for application to gases other than hydrogen, techniques within this test method can be applied to other non-hydrocarbon gas samples requiring THC content determination. This can be achieved by using a zero gas and a calibration gas that consist of the same background gas as the actual sample. As an example, for the THC determination of nitrogen, the instrument zero point must be determined with a high purity grade of nitrogen (99.999 % and 4 in nitrogen in the appropriate range. This will correct for any interferences caused by the background gas.
SCOPE
1.1 This test method describes a procedure for total hydrocarbons (THC’s) measurement in hydrogen intended as a fuel on a methane (C1) basis. The determination of THC on a C1 basis is an analytical technique where all the hydrocarbons are assumed to have the same response as methane (CH4). Sensitivity from 0.1 parts per million by volume (ppm(v), µmol/mol) up to 1000 ppm(v) concentration is achievable. Higher concentrations can be analyzed using appropriate dilution techniques. This test method can be applied to other gaseous samples requiring analysis of trace constituents provided an assessment 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 of separation columns. Therefore, this method does not provide speciation of individual hydrocarbons. Several varieties of instruments 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 CH4 response, which is the sole species used for calibration. Magnitude of the FID response to an atom of carbon is dependent on the chemical environment of this atom in the molecule. This method provides the THC result as if all carbon atoms are from aliphatic, aromatic, olefinic, or acetylenic compounds, where the detector response caused by these atoms is approximately relative to the number of carbon atoms present in the molecule. Other types of molecules, including those containing oxygen or chlorine atoms, will respond differently and usually much lower than the corresponding aliphatic hydrocarbon. Therefore, other methods (Test Methods D7653, D7892, or equivalent) must be utilized to determine the exact constituents of the THC response determined by this method.  
1.3 The proper handling of compressed gas cylinders containing air, nitrogen, hydrogen, or helium requires the use of gas regulators to preclude over-pressurization of any instrument component  
1.4 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally re...

General Information

• Status: Published
• Publication Date: 31-May-2022
• ICS: 27.075 - Hydrogen technologies
• Technical Committee: D03 - Gaseous Fuels
• Drafting Committee: D03.14 - Hydrogen and Fuel Cells

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7675 − 22
Standard Test Method for
Determination of Total Hydrocarbons in Hydrogen by FID-
1
Based Total Hydrocarbon (THC) Analyzer
This standard is issued under the fixed designation D7675; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 1.3 The proper handling of compressed gas cylinders con-
taining air, nitrogen, hydrogen, or helium requires the use of
1.1 This test method describes a procedure for total hydro-
gas regulators to preclude over-pressurization of any instru-
carbons (THC’s) measurement in hydrogen intended as a fuel
ment component
on a methane (C ) basis. The determination of THC on a C
1 1
1.4 Units—The values stated in SI units are to be regarded
basis is an analytical technique where all the hydrocarbons are
as standard. No other units of measurement are included in this
assumed to have the same response as methane (CH ). Sensi-
4
standard.
tivityfrom0.1partspermillionbyvolume(ppm(v),µmol/mol)
1.5 This standard does not purport to address all of the
up to 1000 ppm(v) concentration is achievable. Higher con-
safety concerns, if any, associated with its use. It is the
centrations can be analyzed using appropriate dilution tech-
responsibility of the user of this standard to establish appro-
niques. This test method can be applied to other gaseous
priate safety, health, and environmental practices and deter-
samples requiring analysis of trace constituents provided an
mine the applicability of regulatory limitations prior to use.
assessment of potential interferences has been accomplished.
1.6 This international standard was developed in accor-
1.2 This test method is a Flame Ionization Detector-based dance with internationally recognized principles on standard-
(FID-based) hydrocarbon analysis method without the use of ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
separation columns. Therefore, this method does not provide
mendations issued by the World Trade Organization Technical
speciation of individual hydrocarbons. Several varieties of
Barriers to Trade (TBT) Committee.
instruments are manufactured and can be used for this method.
1.2.1 This method provides a measure of THC “as CH ,”
4
2. Referenced Documents
becauseallhydrocarbonspeciesarequantifiedthesameasCH
4
2
2.1 ASTM Standards:
response, which is the sole species used for calibration.
D4150 Terminology Relating to Gaseous Fuels
Magnitude of the FID response to an atom of carbon is
D7653 Test Method for Determination of Trace Gaseous
dependent on the chemical environment of this atom in the
Contaminants in Hydrogen Fuel by Fourier Transform
molecule.This method provides theTHC result as if all carbon
Infrared (FTIR) Spectroscopy
atoms are from aliphatic, aromatic, olefinic, or acetylenic
D7606 Practice for Sampling of High Pressure Hydrogen
compounds,wherethedetectorresponsecausedbytheseatoms
and Related Fuel Cell Feed Gases
is approximately relative to the number of carbon atoms
D7892 Test Method for Determination of Total Organic
present in the molecule. Other types of molecules, including
Halides, Total Non-Methane Hydrocarbons, and Formal-
those containing oxygen or chlorine atoms, will respond
dehyde in Hydrogen Fuel by Gas Chromatography/Mass
differently and usually much lower than the corresponding
Spectrometry
aliphatichydrocarbon.Therefore,othermethods(TestMethods
3
2.2 EPA Standard:
D7653,D7892,orequivalent)mustbeutilizedtodeterminethe
40 CFR Part 136 Appendix B: Definition and Procedure for
exact constituents of the THC response determined by this
the Determination of the Method Detection Limit
method.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD03onGaseous contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Fuels and is the direct responsibility of Subcommittee D03.14 on Hydrogen and Standards volume information, refer to the standard’s Document Summary page on
Fuel Cells. the ASTM website.
3
Current edition approved June 1, 2022. Published June 2022. Originally AvailablefromUnitedStatesEnvironmentalProtectionAgency(EPA),William
approved in 2011. Last previous edition approved in 2015 as D7675 – 15. DOI: Jefferson Clinton Bldg., 1200 Pennsylvania Ave., NW, Washington, DC 20460,
10.1520/D7675-22. http://www.epa.gov.
Copyright © ASTM International, 100 Barr Harb
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D7675 − 15 D7675 − 22
Standard Test Method for
Determination of Total Hydrocarbons in Hydrogen by FID-
1
Based Total Hydrocarbon (THC) Analyzer
This standard is issued under the fixed designation D7675; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method describes a procedure for total hydrocarbons (THC)(THC’s) measurement in hydrogen intended as a fuel for
fuel cells on a methane (C1)(C ) basis. The determination of total hydrocarbons THC on a C1C basis is an analytical technique
1 1
where all of the hydrocarbons are assumed to have the same response as methane. methane (CH ). Sensitivity from 0.1 partparts
4
per million by volume (ppm(v), μmole/mole)μmol/mol) up to 1000 parts per million (ppm(v), μmole/mole) concentration
areppm(v) concentration is achievable. Higher concentrations can be analyzed using appropriate dilution techniques. This test
method can be applied to other gaseous samples requiring analysis of trace constituents provided an assessment of potential
interferences has been accomplished.
1.2 This test method is an FID-based a Flame Ionization Detector-based (FID-based) hydrocarbon analysis method without the
use of separation columns. Therefore, this method does not provide speciation of individual hydrocarbons. Several varieties of
instruments are manufactured and can be used for this method.
1.2.1 This method provides a measure of total hydrocarbons THC “as methane,”CH ,” because all hydrocarbon species are
4
quantified the same as methaneCH response, which is the sole species used for calibration. Magnitude of the FID response to an
4
atom of carbon is dependent on the chemical environment of this atom in the molecule. This method provides the total hydrocarbon
THC result as if all carbon atoms are from aliphatic, aromatic, olefinic, or acetylenic compounds, where the detector response
caused by these atoms areis approximately relative to the number of carbon atoms present in the molecule. Other types of
molecules, including those containing oxygen or chlorine atoms, will respond differently and usually much lower than the
corresponding aliphatic hydrocarbon. Therefore, other methods (Test Methods D7653, D7892, or equivalent) must be utilized to
determine the exact constituents of the total hydrocarbon THC response determined by this method.
1.3 The proper handling of compressed gas cylinders containing air, nitrogen, hydrogen, or helium requires the use of gas
regulators to preclude over-pressurization of any instrument component
1.4 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of
the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
1
This test method is under the jurisdiction of ASTM Committee D03 on Gaseous Fuels and is the direct responsibility of Subcommittee D03.14 on Hydrogen and Fuel
Cells.
Current edition approved Nov. 1, 2015June 1, 2022. Published December 2015June 2022. Originally approved in 2011. Last previous edition approved in 20112015 as
D7675D7675 – 15.-11. DOI: 10.1520/D7675–15.10.1520/D7675-22.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7675 − 22
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
D4150 Terminology Relating to Gaseous Fuels
D7653 Test Method for Determination of Trace Gaseous Contamin
...