Method of manufacturing ion-selective electrodes for analyzing selected ions in solution
First Claim
1. A method for producing a laminar electrode for determining selected ion concentration in aqueous media, having an ion-selective diaphragm, an electrochemical half-cell with a stable internal reference potential and a metal conductive base layer, the method comprising:
- (a) forming a laminate from the following in succession;
(i) an insulating support, (ii) the conductive base layer, and (iii) the internal reference half-cell;
(b) covering the laminate with a waterproof insulating mask having at least one aperture;
(c) depositing in the aperture a layer of a solution comprising an organic solvent, an ionophore, a plasticizer and a binder;
(d) solidifying the solution by evaporation thereby forming, the ion-selective diaphragm; and
(e) providing a sealed-tight junction zone between the diaphragm and the mask by the solvent used to form the diaphragm being suitable as a solvent for the mask.
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Abstract
There is disclosed a process for producing a laminar electrode. The method comprises successive superposition of an insulating support, a conductive layer, a stable-potential internal reference element and an ion-selective diaphragm, all of which are protected by a mask which is impermeable to aqueous solutions. A completely tight seal between the mask and the ion-selective diaphragm is formed by casting the diaphragm in the form of a solution containing a binder which dissolves with and intimately mixes with the mask material.
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Citations
8 Claims
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1. A method for producing a laminar electrode for determining selected ion concentration in aqueous media, having an ion-selective diaphragm, an electrochemical half-cell with a stable internal reference potential and a metal conductive base layer, the method comprising:
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(a) forming a laminate from the following in succession;
(i) an insulating support, (ii) the conductive base layer, and (iii) the internal reference half-cell;(b) covering the laminate with a waterproof insulating mask having at least one aperture; (c) depositing in the aperture a layer of a solution comprising an organic solvent, an ionophore, a plasticizer and a binder; (d) solidifying the solution by evaporation thereby forming, the ion-selective diaphragm; and (e) providing a sealed-tight junction zone between the diaphragm and the mask by the solvent used to form the diaphragm being suitable as a solvent for the mask. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification