Karl fisher method is used to determination of moisture in the material is a kind of important and sensitive chemical analysis method, but in addition to have a very good measuring instruments, the determination of material in the presence of interfering substances must exist, according to the moisture content of a substance to determine the appropriate sample amount, overcome all kinds of factors affecting measurement precision, careful operation, can obtain the good determination results. In 1935, KarlFischer first proposed the method of using volumetric analysis to determine moisture, which is GB6283 "determination of moisture content in chemical products" in the visual method. The visual method can only determine moisture in colorless liquid substances. Later, it developed into the electric quantity method. With the development of science and technology, the Coulomb method is then combined with the Coulomb method. This method is GB7600 "in operation transformer oil moisture content determination method (Coulomb method)" in the test method. The categorical visual method and the electric quantity method are collectively called the volumetric method. The method is divided into two methods: the carsonite capacity method and the Carsonite Coulomb method. Both methods are standard analytical methods used in many countries to calibrate other analytical methods and measuring instruments.

The determination of moisture by Carsoncoulometry is an electrochemical method. Its principle is the instrument of the cartesian reagent balance in electrolytic cell injection water samples, participate in the REDOX reaction of iodine, sulphur dioxide, water in the presence of pyridine and methanol, generate hydroiodic acid pyridine sulfuric acid and methyl pyridine, consumes of iodine in the anode electrolysis produce, so that the REDOX reaction continuously, until all water run out, According to Faraday's law of electrolysis, the iodine produced by electrolysis is directly proportional to the amount of electricity consumed during electrolysis.

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