ASTM D7675-15

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 total hydrocarbons (measured as methane) 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 total hydrocarbon 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 total hydrocarbon 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 total hydrocarbon determination of nitrogen, the instrument zero point must be determined with a high purity grade of nitrogen (99.999 % and
SCOPE
1.1 This test method describes a procedure for total hydrocarbons (THC) measurement in hydrogen intended as a fuel for fuel cells on a methane (C1) basis. The determination of total hydrocarbons on a C1 basis is an analytical technique where all of the hydrocarbons are assumed to have the same response as methane. Sensitivity from 0.1 part per million (ppm(v), µmole/mole) up to 1000 parts per million (ppm(v), µmole/mole) concentration are 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 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 “as methane,” because all hydrocarbon species are quantified the same as methane 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 total hydrocarbon result as if all carbon atoms are from aliphatic, aromatic, olefinic, or acetylenic compounds, where the detector response caused by these atoms are 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 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 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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2015
• ICS: 27.075 - Hydrogen technologies
• Technical Committee: D03 - Gaseous Fuels
• Drafting Committee: D03.14 - Hydrogen and Fuel Cells

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7675 − 15
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)measurementinhydrogenintendedasafuelfor
ment component
fuel cells on a methane (C1) basis. The determination of total
1.4 The values stated in SI units are to be regarded as
hydrocarbonsonaC1basisisananalyticaltechniquewhereall
standard. No other units of measurement are included in this
of the hydrocarbons are assumed to have the same response as
standard.
methane. Sensitivity from 0.1 part per million (ppm(v), µmole/
mole) up to 1000 parts per million (ppm(v), µmole/mole) 1.5 This standard does not purport to address all of the
concentration are achievable. Higher concentrations can be
safety concerns, if any, associated with its use. It is the
analyzed using appropriate dilution techniques. This test responsibility of the user of this standard to establish appro-
method can be applied to other gaseous samples requiring priate safety and health practices and determine the applica-
analysis of trace constituents provided an assessment of bility of regulatory limitations prior to use.
potential interferences has been accomplished.
2. Referenced Documents
1.2 This test method is an FID-based hydrocarbon analysis
2
2.1 ASTM Standards:
method without the use of separation columns. Therefore, this
D7653 Test Method for Determination of Trace Gaseous
method does not provide speciation of individual hydrocar-
Contaminants in Hydrogen Fuel by Fourier Transform
bons. Several varieties of instruments are manufactured and
Infrared (FTIR) Spectroscopy
can be used for this method.
D7606 Practice for Sampling of High Pressure Hydrogen
1.2.1 This method provides a measure of total hydrocarbons
and Related Fuel Cell Feed Gases
“as methane,” because all hydrocarbon species are quantified
D7892 Test Method for Determination of Total Organic
the same as methane response, which is the sole species used
Halides, Total Non-Methane Hydrocarbons, and Formal-
for calibration. Magnitude of the FID response to an atom of
dehyde in Hydrogen Fuel by Gas Chromatography/Mass
carbon is dependent on the chemical environment of this atom
Spectrometry
3
in the molecule. This method provides the total hydrocarbon
2.2 EPA Standards:
result as if all carbon atoms are from aliphatic, aromatic,
EPA40CRFPart136 AppendixB:DefinitionandProcedure
olefinic, or acetylenic compounds, where the detector response
for the Determination of the Method Detection Limit
causedbytheseatomsareapproximatelyrelativetothenumber
4
2.3 SAE Standards:
of carbon atoms present in the molecule. Other types of
SAE J2719 Hydrogen Quality Guideline for Fuel Cell Ve-
molecules, including those containing oxygen or chlorine
hicles
atoms will respond differently and usually much lower than the
corresponding aliphatic hydrocarbon. Therefore other methods
3. Terminology
(Test Methods D7653, D7892, or equivalent) must be utilized
3.1 Definitions of Terms Specific to This Standard:
to determine the exact constituents of the total hydrocarbon
response determined by this method.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD03onGaseous the ASTM website.
3
Fuels and is the direct responsibility of Subcommittee D03.14 on Hydrogen and AvailablefromUnitedStatesEnvironmentalProtectionAgency(EPA),William
Fuel Cells. Jefferson Clinton Bldg., 1200 Pennsylvania Ave., NW, Washington, DC 20460,
Current edition approved Nov. 1, 2015. Published December 2015. Originally http://www.epa.gov.
4
approved in 2011. Last previous edition approved in 2011 as D7675-11. DOI: Available from SAE International (SAE), 400 Commonwealth Dr.,Warrendale,
10.1520/D7675–15. PA 15096-0001, http://www.sae.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7675 − 15
3.1.1 C1 Hydrocarbon, n—a hydrocarbon carbon content 4.4 To minimize system respons
...

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 − 11 D7675 − 15
Standard Test Method for
Determination of Total Hydrocarbons in Hydrogen by FID
1
Based FID-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) measurement in hydrogen intended as a fuel for fuel
cells on a C1 Basis. Total Hydrocarbons methane (C1) basis. The determination of total hydrocarbons on a C1 basis is an analytical
technique where total carbon is determined and all of the hydrocarbons are assumed to have the same response as
Methane.methane. Sensitivity from 0.1 part per million (ppm,(ppm(v), μmole/mole) up to 1000 parts per million (ppm,(ppm(v),
μmole/mole) concentration are 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 FID based an FID-based hydrocarbon analysis method without the use of separation columns,
therefore,columns. Therefore, this method does not provide speciation of individual hydrocarbons. Varieties Several varieties of
instruments are manufactured and can be used for this method.
1.2.1 This method provides a measure of total hydrocarbons “as methane”,methane,” because all hydrocarbon species are
quantified the same as methane response, which is the sole species used for calibration. Therefore C2 and above hydrocarbons are
quantified 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 total hydrocarbon result as if all carbon atoms are from aliphatic, aromatic, olefinic, or
acetylenic compounds, where the detector response caused by these atoms are 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 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 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D7653 Test Method for Determination of Trace Gaseous Contaminants in Hydrogen Fuel by Fourier Transform Infrared (FTIR)
Spectroscopy
F307D7606 Practice for Sampling Pressurized Gas for Gas Analysisof High Pressure Hydrogen and Related Fuel Cell Feed
Gases
F1398D7892 Test Method for Determination of Total Hydrocarbon Contribution by Gas Distribution System ComponentsOr-
ganic Halides, Total Non-Methane Hydrocarbons, and Formaldehyde in Hydrogen Fuel by Gas Chromatography/Mass
Spectrometry
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 March 15, 2011Nov. 1, 2015. Published April 2011December 2015. Originally approved in 2011. Last previous edition approved in 2011 as
D7675-11. DOI: 10.1520/D7675–11.10.1520/D7675–15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 --------------
...