Sensor for carbon monoxide

Details Sensor for carbon monoxide Sensor for carbon monoxide

1991-05-10

1993-10-05

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204432, 204412, 20415316, G01N 2726

Patent

active

052501710

ABSTRACT:
An electrochemical carbon monoxide detecting method and apparatus (10, 46) is disclosed which can detect carbon monoxide levels as low as about 500 ppm and which has excellent selectivity and a linear response over a broad range of carbon monoxide concentrations. The apparatus (10, 46) employs an electrical cell assembly (12, 54) having an electrolyte (20, 60) containing hydrated Cu(II) ions therein; upon creation of a constant magnitude potential difference between the cell electrodes (22, 24) ranging from about +0.03-+0.15 V, the Cu(II) ions are reduced to Cu(I) ions, and the latter react with carbon monoxide to form Cu(I)-carbonyl complexes. Detection of an electrical parameter indicative of the Cu(II)-Cu(I) reduction permits quantitative carbon monoxide determinations. Preferably, the detecting apparatus (14) is amperometric, employing a potentiostat (28) and output device (38). Alternately, detection can be accomplished potentiometrically.

REFERENCES:
patent: 4797180 (1989-01-01), Schneider et al.
Potentiometric Behavior of the Cooper Electrode in Aqueous Copper(II) Perchlorate Solutions Containing Sodium Chloride; Analytical Chimica Acta 234 (1990) 331-338.
Journal of Organomettalic Chemistry; 44 (1972); Carbonyl Chemistry of the Group IB Metals: M. I. Bruce, pp. 209-226.
Absorption of Carbon Monoxide by Cuprous Ammonium Salts; Industrial and Engineering Chemistry, vol. 22, No. 4 (1930), pp. 382-384.
CA 51-Fossil Fuels, vol. 106, 1987, Carbon Suboxide.
Instrumental Methods in Electrochemistry, Potential Step Techniques; Sec. 2.4, pp. 49-50, 26-32, 398-400, 396-397.
Complex Formation of Copper (I) Perchlorate with Ethylene or Carbon Monoxide in Water and Isolation of Related Complexes; Inorganic Chemistry, vol. 15, No. 9, 1976, pp. 2301-2303.

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