Method and apparatus for electro-chemical measurement

Details Method and apparatus for electro-chemical measurement Method and apparatus for electro-chemical measurement

1978-12-04

1981-06-09

Turk, Arnold

Chemistry: physical processes

Physical processes

Crystallization

23928, 204 1T, 204195R, 204195B, 204292, 324425, 324438, 422 61, 422 76, G01N 2756

Patent

active

042722454

ABSTRACT:
A method and apparatus for measuring a chemical characteristic of a liquid such as its hydrogen ion activity or pH value. A disposable cassette having a reference and indicating electrode therein utilizes the same solution to first calibrate the device and then as an electrolytic bridge from the liquid sample to the reference electrode. The solution has the properties of a buffered pH and also provides a stable electrochemical environment around the reference electrode. In one embodiment, a volume of a liquid sample is placed into a capillary tube and the open end of the tube is then placed over the indicating electrode immersed in the solution. The electrical potential between the indicating electrode and the spaced reference electrode in the electrolyte solution provides a measurement of the pH value of the liquid when compared to the calibration potential previously measured without the liquid sample contacting the indicating electrode.

REFERENCES:
patent: 3049118 (1962-08-01), Arthur et al.
patent: 3873271 (1975-03-01), Young et al.
patent: 3892652 (1975-07-01), Levine et al.
patent: 3911901 (1975-10-01), Niedrach et al.
patent: 4119498 (1978-10-01), Edwall et al.

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