Substances precipitate in the electrolyte of the trace water analyzer
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The determination of trace water in petroleum products (coulometric method) is not used frequently these days; a yellow substance precipitates in the electrolyte and accumulates on the double-platinum needles and the platinum mesh of the electrolytic cathode. How to solve this problem? Why does this happen? What is the main substance that precipitates? How to solve it? How should a micro water analyzer that is not used frequently be maintained on a daily basis?
We can measure the trace water content in oil with high precision; the principle of online capacitive chromatography differs somewhat from that of conventional capacitors
The situation described by the poster likely refers to a coulometric titrator used for the determination of trace amounts of water based on the Karl Fischer method; due to the long storage time of the electrolyte, it becomes ineffective, with its active components converting into organic ammonium salts or sulfates of organic bases and precipitating out. This is a normal phenomenon. When restarting, simply replace the electrolyte with fresh one. If crystals form in the Karl Fischer reagent used in the capacity method, then the reagent is completely ineffective.