Ion-selective electrode and method for preparation thereof

Chemistry: electrical and wave energy – Processes and products

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204 37R, 204 38A, 204 38C, 20412995, 427 58, 427309, 427330, 4273747, C25D 534, G01N 2736

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active

043849270

ABSTRACT:
A dry glass electrode for use in potentiometric analyses of aqueous media. The electrode comprises a metal conductor constituted of platinum, gold, or tantalum, a layer comprising an oxide of the metal having a thickness of between about 50 Angstrom units and about 2 microns on an outer surface of the metal conductor, and an ion-selective glass membrane over and in electrical contact with the oxide layer. The ion-selective glass has a coefficient of thermal expansion differing by less than about 25% from the coefficient of thermal expansion of the metal.
A method for producing the electrode of the invention is also disclosed.

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