Reference electrode with ion barrier for electrochemical measuring systems
AssigneeMettler-Toledo AG
InventorsAndre Nipkow, Eric Bakker
Life of this patent
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Abstract
A reference electrode (2) which features an ion barrier (20) based on the redox principle and which is fashioned as an independent unit or as part of a combination electrode, for instance a single-rod measuring chain. Metal ions to be blocked and contained in the reference electrolyte (24) and the material forming the ion barrier (20) together form a redox system. The ion barrier (20) is preferably a reduction agent which reduces the metal ions to the respective metal, and its properties are such that it will not cause contamination of the diaphragm (6) in oxidized state.
Claims8
In a reference electrode for electrochemical measuring systems, including an electrode shaft equipped with a diaphragm and containing a reference electrolyte, an interior tube received within said electrode shaft with a silver wire therein and an ion barrier between said silver wire and said diaphragm, a portion of said reference electrolyte being in contact with said silver wire and said ion barrier, said portion of reference electrolyte containing silver ions, said ion barrier blocking said silver ions by forming a redox system therewith to precipitate said silver ions as silver metal and thereby preventing said silver ions from migrating to said diaphragm.
Dependencies are inferred from the claim text.