Determination of inorganic halogenated compounds and formic acid -
Ion chromatography method
Warning: Hydrogen is a 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 principle, reagents and materials, apparatus, test procedures, test data processing, precision, quality assurance and control, and test report for the determination of inorganic halogenated compounds and formic acid in hydrogen for proton exchange membrane fuel cell vehicles by ion chromatography method.
This document is applicable to the determination of inorganic halogenated compounds and formic acid in hydrogen for proton exchange membrane fuel cell vehicles. For the determination of inorganic halogenated compounds and formic acid in hydrogen for other purposes, this document can be used as a reference. The determination range of inorganic halogenated compounds and formic acid in hydrogen is 0.025 μmol/mol ~ 0.5 μmol/mol, and the detection limits of hydrogen chloride, chlorine, hydrogen bromide and formic acid in hydrogen are 0.014 μmol/mol, 0.007 μmol/mol, 0.002 μmol/mol and 0.001 μmol/mol, respectively.
Note: The inorganic halogenated compounds in this document refer to hydrogen chloride, chlorine and hydrogen bromide that may be present in hydrogen.
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 629 Chemical reagent - Sodium hydroxide
GB/T 637 Chemical reagent - Sodium thiosulfate pentahydrate
GB/T 639 Chemical reagent - Sodium carbonate anhydrous
GB/T 640 Chemical reagent - Sodium hydrogen carbonate
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 14666 Terms for analytical chemistry
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
JJG 823 Ion Chromatographs
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 14666 apply.
4 Principle
After the inorganic halogenated compounds and formic acid in the hydrogen sample are absorbed by alkaline solution, then halide ions and formate ions are generated, which are exchanged and separated by anion chromatography column, detected by conductivity detector, determined qualitatively according to retention time, and quantitatively by calibration curve.
Contents 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Reagents and materials 6 Apparatus 7 Test procedures 8 Test data processing 9 Precision 10 Quality assurance and control 11 Test report Annex A (Informative) Ion chromatography operation conditions and eluent elution procedures, standard chromatograms and calibration curves Bibliography
