Chemistry: electrical and wave energy – Processes and products
Patent
1983-01-04
1984-06-05
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 1K, 204 1P, 204406, 204407, 204412, 204415, 128635, G01N 2746
Patent
active
044526725
ABSTRACT:
The determination of the concentration of compounds such as CO.sub.2 having an influence on the pH of a medium during polarography is described. Characteristics of polarograms when obtained in unbuffered electrolytes (the polarogram plateau slope position of the upper knee and half-wave potential thereof) are pH-sensitive. These can be detected electronically and signals processed to provide a measure of such concentrations.
In one preferred embodiment (FIG. 2) a miniature pO.sub.2 polarographic sensor has cathode channels (A) and (B) biased respecitvely at -750 mV and -950 mV. The output of channel (A) provides pO.sub.2 as in normal polarography. The output of (B) is divided (6) and further corrected for pO.sub.2 (8,10) to provide pCO.sub.2.
The apparatus is especially useful for simultaneous pO.sub.2, pCO.sub.2 monitoring in physiological fluids without the need for a separate pCO.sub.2 sensor.
REFERENCES:
patent: 3639829 (1972-02-01), Harnoncourt
patent: 3763422 (1973-10-01), MacPhee et al.
patent: 3997420 (1976-12-01), Buzza
patent: 4197853 (1980-04-01), Parker
patent: 4324256 (1982-04-01), Vesterager
patent: 4377446 (1983-03-01), Albery
Delpy David T.
Parker Dawood
Andrews R. L.
Chapman Terryence
University College London
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