Development of a Coulometric Method for Assessing the Concentration of Ambient Levels of CO2/Air in Compressed Gas Mixtures.
The coulometric method presented here is a reliable method for the direct analysis of CO2/air cylinder gas mixtures. It is based on Faraday's laws of electrolysis and therefore no external standardization is required. A series of CO2/air cylinder gas mixtures ranging in concentration from 300 to 375 µmol/mol (ppm) were analyzed and the results compared to those results obtained by non-dispersive infrared (NDIR) analysis with traceability to gravimetric standards. The coulometric method is rapid, sensitive, precise, and with the proper experimental controls, will yield accurate results.
National Institute of Standards and Technology, Gaithersburg, MD 20899.
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Mitchell
National Institute of Standards and Technology, Gaithersburg, MD 20899.
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Bell
N,N-dimethylformatide; carbon dioxide; coulometry; current efficiency; cylinder gases; monoethanolamine