Ion-selective electrode

Abstract

Disclosed is an ion-selective electrode having excellent mechanical strength, excellent durability, low membrane resistance and good ion response accuracy. This ion-selective electrode comprises a response glass membrane which has ion selectivity and is made of an oxynitride glass containing Li.

Description

technical field [0001] The invention relates to an ion selective electrode with excellent mechanical strength and durability, low membrane resistance and high ion response precision. Background technique [0002] In the past, silicate glass was used for the response glass membrane of the ion selective electrode. For this glass, it is required to have small alkali error and acid error, good responsiveness, good chemical durability, potential slope close to the theoretical value, small resistance, and mechanical strength. Various properties such as large size and easy processing. [0003] For the purpose of improving these properties, attempts have been made to add various modifying metals, among which addition of cationic elements has been attempted in order to improve durability. For example, for the purpose of improving chemical durability (water resistance, etc.), it is known that a small amount of La, which is a trivalent element, is contained in silicate glass (Non-Pate...

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Problems solved by technology

[0011] Patent Document 2 discloses a phosphate-based oxynitride glass that replaces oxygen in the phosphate glass with anionic nitrogen and has lithium ion conductivity. However, the phosphate-based oxynitride glass does not exhibit ion selectivity. Sexuality, mechanical strength is also weak, and durability is also poor

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