Reference electrode

Abstract

A reference electrode which does not require the use of a gelled hydrophobic ionic liquid that has a hardness or viscosity at or above a prescribed level that is difficult to manufacture, and that is very thick etc., and which is capable of improving product life cycle. The reference electrode (100) is provided with an internal electrode (1), and a container (3) that contains a filler (2) that electrically connects the internal electrode (1) and a sample liquid (4). The filler (2) forms a layer between the internal electrode (1) and an opening (31) provided to the container (3) so that the sample liquid (4) and the filler (2) come into contact. The filler is composed of: a first layer (21) comprising an aqueous electrolyte solution, formed so as to come into contact with the internal electrode; a second layer (22) comprising a hydrophobic ionic liquid, formed so as to come into contact with the first layer; and a third layer (23) comprising a gelled hydrophobic ionic liquid, that comes into contact with the second layer (22) and is formed in the opening (21).

Description

technical field [0001] The present invention relates to a reference electrode used as a reference for calculating electrode potential and as a reference for electrochemical measurement. Background technique [0002] In pH measurement etc., there are electrodes with the following structure as internal electrodes used to represent a constant reference potential: For example, an internal electrode composed of silver / silver chloride is immersed in an internal liquid composed of a high-concentration KCl solution. The internal liquid is in contact with the sample liquid through a liquid junction made of a porous material such as ceramics or glass. [0003] However, if a high-concentration KCl solution is used as the internal liquid of the reference electrode, due to K ＋ and Cl － Usually, it flows out to the sample liquid side through the liquid junction, that is, KCl flows out into the sample liquid through the liquid junction, resulting in a decrease in the KCl concentration of...

AI Technical Summary

Problems solved by technology

Therefore, the ionic liquid in the gel may become below the specified amount, and it may be difficult to extend the product life.

[0006] In view of the above problems, it may be considered to increase the thickness of the gel of the hydrophobic ionic liquid so that it contains a large amount of ionic liquid, but for example, use the gel of the hydrophobic ionic liquid alone to maintain the hardness of the degree of sustainable shape retention, and at the same time Increasing the thickness and size of the gel is technically difficult and expensive to manufacture

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