Electrical measuring cell for determinging ammonia, amines, hydr

Details Electrical measuring cell for determinging ammonia, amines, hydr Electrical measuring cell for determinging ammonia, amines, hydr

1993-02-19

1994-09-06

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

20415314, 204412, G01N 27404

Patent

active

053445465

ABSTRACT:
The invention is directed to an electrochemical cell for measuring ammonia, amines, hydrazine and hydrazine derivatives and includes a measuring electrode in an electrolyte. The measuring electrode is provided with a coating made of a transition metal oxide and is improved in that its measuring sensitivity during long-term loading is increased. The cross sensitivity of the measuring cell is reduced especially with respect to NO.sub.2 and SO.sub.2. For this purpose, the oxide constituents of the coating are made of a metal conducting oxide of one element or an oxide mixture of several elements of the platinum metal group. Oxides of ruthenium and iridium have proven especially useful. The invention is also directed to an electrochemical measuring cell for measuring ammonia or hydrazine and includes at least a measuring electrode and a counter electrode in an electrolyte. The measuring cell provides a signal increase having a shorter response time and an improved signal stability. For this purpose, the electrolyte is an aqueous solution of a hygroscopic salt of an alkali metal or alkaline earth metal such as calcium nitrate or lithium nitrate or a mixture of both salts.

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