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Operation Method of Cassette Moisture Analyzer

May 22, 2020

Moisture Analyzer Manufacturer introduces this news to you.

The high-precision standard piston-type burette and anti-diffusion titration head of the Karl Fischer moisture analyzer ensure high-precision potentiometric titration. The push-fit design of the burette makes it easy and quick to replace at any time.

Principle of Moisture Analyzer

In 1.1935 Karl-Fischer (KarlFischer) first proposed the method of measuring moisture using capacity analysis, this method is the visual method in GB6283 "Determination of Moisture Content in Chemical Products". The visual method can only measure the moisture of colorless liquid substances. Later, it developed into the electricity method. With the development of science and technology, the coulomb counter and the volume method are combined to introduce the coulomb method. This method is the test method in GB7600 "Determination of Moisture Content of Transformer Oil in Operation (Coulomb Method)". The classification visual method and the electricity method are collectively called the volume method. The Karl Fischer method is divided into two methods: the Karl Fischer volume method and the Karl Fischer Coulomb method. Both methods have been established as standard analytical methods in many countries, and are used to calibrate other analytical methods and measuring instruments.

2.The Karl Fischer Coulometric method is an electrochemical method for determining moisture. The principle is that when the Karl Fischer reagent in the instrument's electrolytic cell reaches equilibrium, the water-containing sample is injected, the redox reaction of ginseng and iodine, sulfur dioxide, and pyridine hydroiodate and pyridine methyl sulfate are generated in the presence of pyridine and methanol. The consumed iodine is produced at the anode electrolysis, so that the redox reaction continues until the water is completely exhausted. According to Faraday's law of electrolysis, the iodine produced by electrolysis is proportional to the amount of electricity consumed during electrolysis.

The reaction is as follows:

Anode: 2I--2e→I2

Cathode: I2+2e→2I-


It can be seen from the above reaction that 1 mole of iodine requires 1 mole of water to oxidize 1 mole of sulfur dioxide. Therefore, it is the equivalent reaction of 1 mole of iodine and 1 mole of water, that is, the amount of electricity for electrolytic iodine is equivalent to the amount of electricity for electrolyzed water. The electrolysis of 1 mole of iodine requires 2×96493 coulombs of electricity, and the electrolysis of 1 millimole of water requires 96493 millicoulons of electricity.

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