chapter5determinationofmoisture(編輯修改稿)
2024-11-29 17:59 本頁面
【文章內(nèi)容簡(jiǎn)介】 then water in samples is vaporized. The loss of weight is moisture content of samples. ? Applying range: There is no other volatile materials besides water. furthermore, the sample is stable when heating. For samples containing above 16% moisture ? Twostage drying method: A sample is first allowed to equilibrate with the air. A subsample is then ground for the determination of the remaining moisture. Vacuumoven methods ? Principle: water’s boiling point is decreased under vacuum. ? Applying range:： samples who are easily degenerative when heating above 100℃ , such as fruits, vegetables, syrup, etc. 2. Distillation methods ? Distillation with an immiscible solvent under a refluxingtype of condenser. ? The mixture of water a
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