Ion-selective electrode
First Claim
1. A dry glass electrode for use in potentiometric analysis of aqueous media comprising a metal conductor constituted of a metal selected from the group consisting of platinum, gold, and tantalum, a layer comprising an oxide of said metal having a thickness of between about 50 Angstrom units and about 2 microns on an outer surface of said metal conductor, and an ion-selective glass membrane over and in electrical contact with said oxide layer, said ion-selective glass having a coefficient of thermal expansion differing by less than about 25% from the coefficient of thermal expansion of said metal.
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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.
55 Citations
10 Claims
- 1. A dry glass electrode for use in potentiometric analysis of aqueous media comprising a metal conductor constituted of a metal selected from the group consisting of platinum, gold, and tantalum, a layer comprising an oxide of said metal having a thickness of between about 50 Angstrom units and about 2 microns on an outer surface of said metal conductor, and an ion-selective glass membrane over and in electrical contact with said oxide layer, said ion-selective glass having a coefficient of thermal expansion differing by less than about 25% from the coefficient of thermal expansion of said metal.
Specification