Method and apparatus for electro-chemical measurement

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

G - Physics

01

N

324/23

G01N 27/416 (2006.01) G01N 27/403 (2006.01)

Patent

CA 1142225

TGC-104 ABSTRACT OF THE DISCLOSURE 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 pro- vides 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.

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