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

1991-05-06

1993-03-30

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

20415314, 20415317, 204412, 204415, G01N 27404

Patent

active

051980924

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 containing a cobalt salt dissolved therein. 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: 2651612 (1953-09-01), Haller
patent: 2898282 (1959-08-01), Flook et al.

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