Electrochemical gas monitor

Details Electrochemical gas monitor Electrochemical gas monitor

1976-02-05

1977-11-08

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204 1T, 204195R, 324 29, G01N 2740, G01N 2752, G01N 2754

Patent

active

040574784

ABSTRACT:
An electrochemical detection system is disclosed for measuring the amount of carbon monoxide or similar oxidizable gases present in a gas phase mixture wherein the gas phase mixture is brought into contact with a liquid electrolyte through a gas-permeable measuring electrode. The improved electrode is formed of a porous membrane of chemically-inert non-wettable material, on one side of which a layer of gold is specially deposited for contact with an electrolyte of a substantially pure aqueous solution of perchloric acid. An electrical readout system is connected to the electrode for deriving a signal from the resulting oxidation current, which corresponds to a quantitative measure of the oxidation of the gas at the electrode-electrolyte interface. In addition to the special method for forming the electrode, a method for rejuvenating it after each sample measurement is disclosed wherein the electrode is successively impressed with an oxidizing (anodic) voltage, a reducing (cathodic) voltage and a working or reading voltage in an appropriate time sequence.

REFERENCES:
patent: 3239444 (1966-03-01), Heldenbrand
patent: 3622488 (1971-11-01), Chand et al.
patent: 3685346 (1972-08-01), Molloy
patent: 3776832 (1973-12-01), Oswin et al.
patent: 3855096 (1974-12-01), Bergman
patent: 3878080 (1975-04-01), Luck
Kathleen D. N. Brummer, J. of Catalysis, vol. 9, No. 3, pp. 207-216 (1967).

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