Amperometric method and apparatus

Chemistry: electrical and wave energy – Apparatus – Electrolytic

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20415317, 204400, G01N 2740

Patent

active

049851306

ABSTRACT:
A method for determination of a first electroactive and normally gaseous species (EAGS) and a second EAGS in a fluid medium containing both EAGS; the medium is contacted with a first working electrode that is sensitive but to the first EAGS and generates a first amperometric signal that is indicative of the first EAGS concentration; the medium is also contacted with a second working electrode that is sensitive to both EAGS and produces a second amperometric signal that is indicative of the sum of both EAGS concentrations; the second EAGS concentration is calculated from the difference between the first and the second signal. For example, hydrogen can be measured in the presence of oxygen and this can be applied to monitor a fluid ambient or stream to prevent formation of explosive mixtures or corrosive conditions.
An apparatus suitable for use in the method may comprise two separate MEACS each having a generally conventional structure, or may be in the form of a novel integrated cell structure including at least two sensing electrodes and at least one counter electrode. This provides for safe and simple monitoring under differing ambient conditions and without critical impact of operating parameters such as membrane thickness.

REFERENCES:
patent: 3208926 (1965-09-01), Eckfeldt
patent: 3413199 (1968-11-01), Morrow
patent: 3539455 (1970-11-01), Clark
patent: 3629089 (1971-12-01), Luck
patent: 4197853 (1980-04-01), Parker
patent: 4315753 (1982-02-01), Bruckenstein et al.

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