1. Advantages of the Karl Fischer Coulomb method: the instrument has a medium price; few consumables; it can be measured to 10-6; the time is short, and the general substance can be measured within 60 seconds under the premise of mastering the sample injection volume, which is process control and arbitration The best way to judge. Disadvantages: Due to the high accuracy, it is too sensitive. Some substances with side reactions such as ketones and aldehydes are more difficult to measure, and need some experience to control the direction of the reaction.
2. Distillation azeotropic method, advantages: the price is relatively cheap, the selectivity is good, suitable for measuring petroleum products. Disadvantages: poor accuracy and long measurement time. Products with larger water content are suitable.
3. Karl Fischer volume method, advantages: more test varieties, better versatility than coulomb method, less sensitive and less interference by side reactions, such as (such as ketones, aldehydes). Disadvantages: In the best condition, it can only measure to 10-4 level; consumables (reagents) are large; measurement time is too long.
4. Traditional drying method, advantages: low price and good versatility. Disadvantages: poor accuracy; can only be measured to 10-3 level; volatile substances are also evaporated in the process of dry distillation, can not determine the true value of the moisture content of the substance, the test time is too long.
5. Other special methods: capacitance / resistance method, suitable for rough measurement of paper, wood, grain and other materials; near infrared method, suitable for online measurement of substances with large water content; electrolytic (phosphoric acid) method, suitable for online measurement of gas; pressure difference method, Suitable for measuring volatile substances; dew point method, suitable for measuring gas; in addition to cloud point method; phosphoric acid gravimetric method; crystallization method and other uncommon methods.
6. Spectroscopy, chromatography, advantages: can be measured to 10-6 level. Disadvantages: expensive instruments; high environmental requirements; long preparation time (several hours); not conducive to product process control.
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