Method and electrochemical sensing strip with screen-printed three electrodes for determining concentration of dissolved oxygen in a solution
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United States of America Patent
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Issued Date -
Nov 8, 2007
app pub date -
Nov 29, 2006
filing date -
Apr 14, 2006
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Abstract
A new electrochemical method for determining dissolved oxygen concentration is developed. It employs cobalt based oxide or complex to modify a conductive electrode surface. This method can be applied to determine dissolved oxygen in regard to medical and environmental demands. The chemical formula of the cobalt based oxide or complexes can be shown as Co.sub.xO.sub.y or Co.sub.aL.sub.b. Both 'x' and 'a' represent the number of cobalt atom; while 'y' and 'b' represent the number of oxygen atom and the number of coordinating ligand, respectively. For instance, the best known example of cobalt oxide is CO.sub.3O.sub.4, and the best known examples of cobalt complexes are cobalt phthalocyanine (CoPC) and cyanocobalamin (vitamin B.sub.12), or other macrocyclic complexes with a metallic nucleus of cobalt. The present invention determines the concentration of dissolved oxygen in solution in potentiostatic mode with three electrodes. As a result, the dissolved oxygen can be determined between 0.0V and -0.3V vs. Ag/AgCl, thereby significantly reducing the interferences from the easily oxidized compounds in water solutions.
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