Carbon sensor electrode and process for producing the same

Details Carbon sensor electrode and process for producing the same Carbon sensor electrode and process for producing the same

1994-10-04

1996-04-02

Bell, Bruce F.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204294, 204418, 204415, 204282, 204402, 204403, G01N 2726, C25B 1100

Patent

active

055037283

ABSTRACT:
A carbon electrode is dipped in a solution containing a reactive substance, and the carbon electrode impregnated with the solution is covered with an insulating tubular member; or a solution containing a reactant is poured into an insulating tube, and a carbon electrode is inserted into the tube; whereby the reactant is made coexistent in the periphery of the carbon electrode. Alternatively, a reactive substance such as an active enzyme and graphite particles or activated carbon particles are mixed with a liquid and dispersed therein to prepare a thoroughly wetted paste. The paste is introduced by means of an extruding mechanism such as a syringe into an insulating tubular member in which a bundle of many thin carbon rods as a lead is inserted. Thus, a carbon sensor electrode is produced. Alternatively, a first carbon electrode that has been dipped in an active enzyme or an enzyme-like reactive substance solution is disposed in a wet condition in a cylindrical ion permeable membrane. To prevent the enzyme or enzyme-like reactive substance in the electrode from becoming deactivated with the passage of time, a preliminary electrode is further inserted into the insulating tubular member, whereby the potential can be kept to be oxidation or reduction potential so as to ensure a constant sensor life. A fresh electrode surface having the active enzyme or enzyme-like reactive substance can be easily obtained by cutting or snapping off a tip portion of the sensor including the insulating tubular member.

REFERENCES:
patent: 4439303 (1984-03-01), Cocchi
patent: 4756813 (1988-07-01), Stanley
patent: 5174883 (1992-12-01), Martin et al.
patent: 5272087 (1993-12-01), El Murr et al.
patent: 5281319 (1994-01-01), Kaneko et al.

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