Electrochemical measuring cell for amperometrically determining

Details Electrochemical measuring cell for amperometrically determining Electrochemical measuring cell for amperometrically determining

1989-12-11

1990-10-09

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

20415314, 204415, G01N 2731

Patent

active

049618342

ABSTRACT:
The invention is directed to an electrochemical measuring cell for determining ammonia and its derivatives in a gaseous or liquid measuring sample. The measuring cell has at least one anode and at least one cathode 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 more selective ammonia sensor having the following advantages: a short response time, a linear response and exhibits the lowest possible tendency toward drift. The electrolyte of the measuring cell is so configured that the reaction products of the measuring reaction do not affect subsequent measurements. For this purpose the measuring cell, which operates in an amperometric measuring mode, contains a soluble non-oxidizable reagent in the electrolyte which reacts completely with ammonia to form an oxidizable product which is convertible by its oxidation into non-oxidizable soluble secondary products which are chemically and electrochemically inert.

REFERENCES:
patent: 3649505 (1972-03-01), Strickler et al.
patent: 3830718 (1974-08-01), Riseman et al.
patent: 3869354 (1975-03-01), Montalvo
patent: 4297173 (1981-10-01), Hikuma et al.
patent: 4842697 (1989-06-01), Driscoll et al.

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