GB/T 44243-2024 Hydrogen for proton exchange membrane fuel cell vehicles - Determination of sulfur compounds, formaldehyde and organic halides - Gas chromatography method
Warning: Hydrogen is a flammable and explosive gas. This document does not cover all safety issues related to its application. Before using this document, users are responsible for formulating corresponding safety and protective measures, clarifying its limited scope of application, and ensuring compliance with relevant national laws, regulations, and mandatory national standards.
1 Scope
This document describes the principles, reagents and materials, instruments and equipment, system performance verification, test procedures, test data processing, precision and accuracy, quality assurance and control, and test report for the determination of contents of sulfur compounds, formaldehyde and organic halides in hydrogen for proton exchange membrane fuel cell vehicles using the pre-concentration-gas chromatography-sulfur chemiluminescence detector/mass spectrometry detector method.
This document is applicable to the determination of sulfur compounds, formaldehyde and organic halides in hydrogen for proton exchange membrane fuel cell vehicles. For the determination of sulfur compounds, formaldehyde and organic halides in hydrogen for other purposes within the range specified in this document, reference may be made to this document.
The determination range of sulfur compounds in this document is 0.10 nmol/mol to 10.0 nmol/mol and the detection limit of hydrogen sulfide is 0.01 nmol/mol. The determination range of formaldehyde is 1.0 nmol/mol to 400.0 nmol/mol and the detection limit is 0.1 nmol/mol. The determination range of organic halides is 1.0 nmol/mol to 100.0 nmol/mol and the detection limit of methyl chloride is 0.5 nmol/mol.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. 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
No terms and definitions are listed in this document.
4 Principle
The sample shall be introduced into a gas concentrator to capture and desorb the target compound. The desorbed sample shall be then directed into a gas chromatograph equipped with a non-polar capillary chromatographic column. After separation by the chromatographic column, the components to be determined shall be passed through a splitter assembly, with one path entering a sulfur chemiluminescence detector for sulfur-containing compound detection and the other path entering a mass spectrometer detector for formaldehyde and organic halide detection. The external standard method is used for quantification.
5 Reagents and materials
6 Instruments and equipment
7 System performance verification
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Instruments and equipment
7 System performance verification
8 Test procedures
9 Test data processing
10 Precision and accuracy
11 Quality assurance and control
12 Test report
Annex A (Informative) Parameters and operating conditions of the gas concentrator
Annex B (Informative) Gas chromatography with the configuration of SCD and MSD
Annex C (Informative) Examples of preparation methods for calibration samples at different content levels
Annex D (Informative) Confirmation of the limit of detection
Annex E (Informative) Precision typical value
Bibliography
