Process for electrochemical measurement of the concentration of

Details Process for electrochemical measurement of the concentration of Process for electrochemical measurement of the concentration of

1987-10-09

1990-06-19

Nguyen, Nam X.

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

204422, G01N 27411

Patent

active

049351079

ABSTRACT:
The invention concerns a process and apparatus for electrochemical measurement of the concentration of oxide ions dissolved in a bath based on molten halides. The process is based on impedance measurement at a low current and a low overvoltage, between an indicator electrode, a reference electrode and a counter electrodes. The real value Z.sub.r of the impedance is determined for two frequencies, a low frequency Zr(B) (such as 15-25 Hz) and a high frequency Zr(H) (such as 10-100 kHz); the inverse of the concentration of oxide ions is a linear function of the difference between Zr(B) and Zr(H). This method has a high level of accuracy in the low ranges of concentration of oxide ions.

REFERENCES:
patent: 3791954 (1974-02-01), Noda et al.
patent: 4639304 (1987-01-01), Bader et al.
Bard et al., "Electrochemical Methods", John Wiley & Son, Inc., 1980, pp. 316-367.

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