The Karl Fischer method for the determination of moisture is an electrochemical method. The principle is that the Karl Fischer reagent in the electrolysis cell of the instrument is injected into the aqueous sample when the equilibrium is reached, the water participates in the redox reaction of iodine and sulfur dioxide, and in the presence of pyridine and methanol, pyridine hydroiodide and pyridine thiosulfate are formed. The consumed iodine is generated by electrolysis at the anode, 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 volumetric Karl Fischer moisture meter is a precise metering system that accurately titrates Karl Fischer reagent into a sealed titration cell that is added to the sample to be tested, and calculates the total amount of Karl Fischer reagent consumed at the end of the calculation. The total amount of water that is reacted in the sample, which in turn gives the moisture content of the sample. 1. The volumetric method is suitable for measuring liquid and solid samples, and the Coulomb method is suitable for measuring liquids and gases. 2, the volume method is more suitable for measuring more than 1% of water, not suitable for measuring water below 0.01% water content; Coulomb method is more suitable for measuring water below 0.01% water content, not suitable for measuring more than 1% water. 3. If a variety of samples are measured, chemical reactions may occur between different samples, and the volumetric method must be used. 4. If the pharmaceutical industry is basically a capacity method. The volumetric method measures a wider variety of samples. There is no absolute fundamental difference between the two methods. It is necessary to judge by experience. Generally speaking, if the water content is above 0.01%, it is not a gas sample. The volumetric method is correct. Easy to choose, often users first buy the Coulomb method, and later have to change the volume method, but the first to buy the capacity method to change the Coulomb method is almost no. Heavy duty steel picket palisade fence,Secruity Palisade Fencing,Galvanized Steel Palisade Fence,Colorful Steel Palisade Fence Hebei Giant Metal Technology Co., Ltd. , https://www.hebeigiantmetal.com