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Process for analyzing CO.sub.2 in air and in water

United States Patent

5,910,448
June 8, 1999
View the Complete Patent at the US Patent & Trademark Office
The process of this invention comprises providing a membrane for separating CO.sub.2 into a first CO.sub.2 sample phase and a second CO.sub.2 analyte phase. CO.sub.2 is then transported through the membrane thereby separating the CO.sub.2 with the membrane into a first CO.sub.2 sample phase and a second CO.sub.2 analyte liquid phase including an ionized, conductive, dissociated CO.sub.2 species. Next, the concentration of the ionized, conductive, dissociated CO.sub.2 species in the second CO.sub.2 analyte liquid phase is chemically amplified using a water-soluble chemical reagent which reversibly reacts with undissociated CO.sub.2 to produce conductivity changes therein corresponding to fluctuations in the partial pressure of CO.sub.2 in the first CO.sub.2 sample phase. Finally, the chemically amplified, ionized, conductive, dissociated CO.sub.2 species is introduced to a conductivity measuring instrument. Conductivity changes in the chemically amplified, ionized, conductive, dissociated CO.sub.2 species are detected using the conductivity measuring instrument.
Atwater; James E. (Eugene, OR), Akse; James R. (Roseburg, OR), DeHart; Jeffrey (Yoncalla, OR)
Umpqua Research Company (Myrtle Creek, OR)
08/ 826,645
April 4, 1997
This invention was made with U.S. Government support under Grant Number DE-FG03-93ER81641 awarded by the Department of Energy. The U.S. Government has certain rights in the invention.