GB/T 44238-2024 Hydrogen for proton exchange membrane fuel cell vehicles - Determination of helium, argon, nitrogen and total hydrocarbons - Gas chromatography method
Warning: Hydrogen is a kind of flammable and explosive gas. This document does not address all safety issues related to its application. It is the responsibility of the users to prepare corresponding safety and protection measures, define the application scope, and ensure conformance to the relevant national laws and regulations and mandatory national standards before using this document.
1 Scope
This document describes the principles, reagents and materials, instruments and equipment, samples, test procedures, test data processing, precision and accuracy, quality assurance and control, and test reports for the determination of helium, argon, nitrogen and total hydrocarbon components in hydrogen for proton exchange membrane fuel cell vehicles by gas chromatography-thermal conductivity detector/flame ionization detector method.
This document is applicable to the determination of the content of helium, argon, nitrogen and total hydrocarbon components in hydrogen for proton exchange membrane fuel cell vehicles. The content range of hydrogen for other purposes is within the range specified in this document. The determination of helium, argon, nitrogen and hydrocarbon component content shall be implemented with reference.
The measurement range of various components in this document: helium, 10.0 μmol/mol~600.0 μmol/mol; argon, 5.0 μmol/mol~300.0 μmol/mol; nitrogen, 5.0 μmol/mol~300.0 μmol/mol; methane (C1) in total hydrocarbons, 0.10 μmol/mol~200.0 μmol/mol; C2 ~ C6 components and toluene in total hydrocarbons: 0.10 μmol/mol~2.0 μmol/mol.
Note: In this document, hydrocarbons refer to the hydrocarbons that may exist in hydrogen gas, including alkanes, alkenes, alkynes, and aromatic hydrocarbons.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 43306 Gas analysis - Sampling guidelines
GB/T 44262 Technical requirements for sampling of hydrogen for proton exchange membrane fuel cell vehicles
JJF 1342 General requirements for the competence of reference material producers
3 Terms and definitions
None.
4 Principle
A gas chromatography latent meter equipped with thermal conductivity detector and flame ionization detector is used. The specimen is divided into two channels through the injection pipeline, one of which enters the quantitative ring connected to the ten-way valve. By regulating the opening and closing time of the valve, the non-target components are back-blown and vented by the pre-separation column, and the target components nitrogen, hydrogen and nitrogen are separated through the molecular sieve column and detected by the thermal conductivity detector; the other channel of specimen enters the quantitative ring connected with the six-way valve, the aluminum oxide chromatographic column and the large flame ionization detector to realize the separation and detection of the total hydrocarbon components. It is quantified by external standard method.
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatuses
7 Test procedures
8 Test data processing
9 Precision and accuracy
10 Quality assurance and control
11 Test report
Annex A (Informative) Gas flow path and operating conditions of typical gas chromatograph
Annex B (Informative) Typical values of precision
Bibliography
