Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1988-05-27
1991-12-10
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
20415314, 20415319, 204400, 204415, 356326, G01N 2727, G01N 2740
Patent
active
050715267
ABSTRACT:
The present invention provides a sensor, preferably an electrochemical sensor, for detecting acidic gases, e.g. carbon dioxide. The electrochemical sensor has a sensing electrode (20, 22), a counter electrode (37) and a body of electrolyte containing a complex, e.g. copper(II) bis(propanediamine), which has one or more ligands that is displaceable by the presence of the acidic gas in the electrolyte to form a modified complex which can be electrochemically reacted at the sensing electrode at a potential at which the unmodified complex is unreactive. The acidic gas diffuses into the electrolyte through a porous membrane. The modified complex can also be detected colorimetrically because it absorbs light at a different wavelength to the unmodified complex.
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Evans John
Gibbs Trevor K.
Pletcher Derek
Warburton Piers R. G.
Neotronics Technology PLC
Tung T.
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