Electrochemical measuring cell for determining ammonia or hydraz

Details Electrochemical measuring cell for determining ammonia or hydraz Electrochemical measuring cell for determining ammonia or hydraz

1990-04-12

1991-12-31

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

20415314, 20415317, 204415, G01N 27404

Patent

active

050769049

ABSTRACT:
The invention is directed to an electrochemical measuring cell for determining ammonia or hydrazine in a gaseous or liquid measuring sample. The measuring cell has at least one measuring electrode and at least one counter electrode which are disposed in an electrolyte chamber filled with a soluble electrolyte. The electrolyte chamber is closed off in the direction facing toward the measuring sample by a permeable membrane. The measuring cell provides a selective ammonia measurement having the following advantages: a short response time, a linear response and a low tendency to drift. The electrodes of the measuring cell are so configured that the oxidation of the ammonia as a measurement reaction has no influence on the sensitivity of the measuring cell. For this purpose, at least the measuring electrode is provided with a coating containing cobalt oxide which is in direct contact with the electrolyte.

REFERENCES:
patent: 3649505 (1972-03-01), Strickler et al.
patent: 3849201 (1974-11-01), Kordesch
patent: 4127462 (1978-11-01), Blurton et al.
patent: 4201634 (1980-05-01), Stetter
patent: 4599157 (1986-07-01), Suzuki et al.
Ives et al., Reference Electrodes, Theory and Practice, Academic Press, New York, 1961, pp. 356-360.
Encyclopedia of Electrochemistry of the Elements, vol. 8, 1978, p. 413.

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