Detection of hydrogen purity
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The company’s hydrogen production system uses a methanol cracking process; previously, gas chromatography was used to determine the levels of impurities such as CO, CO2, and CH4, and then the purity of hydrogen was calculated from those values. But now some customers require that nitrogen, oxygen, and moisture levels be tested in accordance with the standards specified in \"Food Additives – Hydrogen GB 31633-2014\". I would like to know what testing instruments are being used by those in the industry, so that I can decide on the instruments I need to purchase as well. Thank you!
Electrochemical method and optical cavity ring-down spectroscopy (not commonly used), or microcoulometry in water. Refer specifically to GB/T3634.1 and GB/T3634.2