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A novel method for the detection and quantitation of airborne carbon dioxide is described. The method is based upon membrane transport, chemical amplification, and conductimetric detection. Gas phase CO2 is equilibrated across a hydrophobic hollow fiber membrane with a primary, secondary, or tertiary alkanolamine containing aqueous phase. The resulting dissolved carbon dioxide reacts reversibly with both water and the alkanolamines to form a variety of ionic species, including: carbonate, bicarbonate, carbamates, and protonated amines. At equilibrium, the CO2 holding capacities of the alkanolamine solutions are several orders of magnitude greater than that of pure water, resulting in a substantial amplification of the conductivity signal for solutions in equilibrium with a given atmospheric pCO2.
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Atwater et al. (2000) studied this question.
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