Editor's note: Moisture analysis methods can generally be divided into two categories, namely physical analysis and chemical analysis. This article introduces several classic methods of moisture analysis. The classic moisture analysis method has been gradually replaced by various moisture analysis methods. At present, the main moisture analyzers on the market> moisture analyzers are mainly Karl Fischer moisture analyzers> moisture analyzers, coulometric moisture analyzers, microwave moisture analyzers, Infrared moisture meter, dew point moisture meter, and some special moisture meters. The measuring methods of these instruments are easy to operate, have high sensitivity and good reproducibility, and can continuously measure and automatically display data. The Coulomb Moisture Analyzer is commonly used to determine the moisture content of gases. This method is easy to operate and quick to respond, and is particularly suitable for determining trace moisture in gases. If it is determined by a general chemical method, it is very difficult. However, the electrolytic method is not suitable for the determination of alkaline substances or conjugated diolefins. The microwave moisture analyzer uses the microwave field to dry the sample. Milliporesdi accelerates the drying process. It has the characteristics of short measurement time, easy operation, high accuracy, and wide application range. It is suitable for grains such as grain, paper, wood, textiles and chemical products. , Determination of moisture in powdered and viscous solid samples, can also be applied to the determination of moisture in petroleum, kerosene and other liquid samples. The infrared moisture analyzer is simple to operate, takes less time, and the measurement results are correct. Therefore, the infrared moisture analyzer can be widely used in experimental analysis and daily purchase control and process detection in the chemical, pharmaceutical, food, tobacco, and grain industries. The dew point moisture analyzer is easy to operate, the instrument is not complicated, and the measured results are generally satisfactory. It is often used for the determination of trace moisture in permanent gases. However, this method has more interference, and some easily exchangeable gases will cause condensation before water vapor condenses, especially at higher concentrations. The Karl Fischer method is a classic method. After recent improvements, it has greatly improved accuracy and expanded the measurement range. It has been listed as the standard method for the determination of moisture in many substances.
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