The trace moisture analyzer under UHV power can help many power workers conduct various power tests more conveniently.

Karl Fischer titration method for determining moisture content

principle:

The Karl Fischer titration method is used as a reference method for many substances and is a chemical analysis method based on the oxidation of sulfur dioxide by iodine in methanol hydroxide solution. In principle, the following chemical reactions will occur:

H 2 O + I 2 + SO 2 + CH 3 OH + 3RN -> [RNH]SO 4 CH 3 + 2[RNH]I

Titration can be carried out by volumetric or potentiometric methods.

In the volumetric method, add Karl Fischer solution containing iodine until the first trace of excess iodine appears. The amount of iodine converted is determined by the volume of the burette containing iodine Karl Fischer solution.

In the Coulombic method, the iodine involved in the reaction is directly generated in the titration cell through the electrochemical oxidation of iodide, until trace amounts of unreacted iodine are detected again. Faraday's law can be used to calculate the amount of iodine produced by the required amount of electricity.

Application:

The Karl Fischer titration method is a specialized moisture determination method for water, suitable for samples with high moisture content (titration method) and also for samples with moisture content in the ppm range (Coulombic method). It was originally developed for non-aqueous liquids, but is also applicable to solids if they are soluble or if the water they contain can be removed by heating in an air stream or by extraction.

Benefits:

The accurate reference method, Coulomb method, is also suitable for trace analysis and moisture detection.

Limitations:

The working method must be adapted to the specific sample.