A method and a device for quantitative electrochemical in situ measurements in water at high temperature

摘要

A method and a device for quantitative electrochemical in situ measurements in water at high temperature. At least two electrode pairs are arranged to determine simultaneously the contents of two molecules or ions, dissolved in the water, by means of an electrochemical measuring method starting from measurement of kinetics, adsorption or the diffusion behaviour of the molecules/ions in connection with electrochemical reactions on or adjacent to the metal electrodes. The electrochemical reactions for the molecules/ions are determined by a first electrode pair (21) consisting of two metal electrodes of an inert metal (211, 212), preferably gold or platinum metal, and a second electrode pair (22) comprising an electrode of an inert metal (221) and a metal electrode (222) which is provided with a surface layer (225). This surface is adapted to influence kinetics, adsorption, or the diffusion behaviour in connection with an electrochemical reaction of the second molecule/ion such that the sensitivity to the reactions of the first molecule/ion is essentially the same for both electrode pairs, whereas the sensitivity to the reactions of the second molecule/ion differs considerably between the electrode pairs, thus allowing the two molecules/ions to be distinguished.