1. Dew point method: The dew point method is easy to operate, the instrument is not complicated, and the measured results are generally satisfactory, and are often used for the determination of trace moisture in permanent gases. However, this method has a lot of interference, and some of the cold-changing gases will interfere with the condensation of water vapor especially at higher concentrations.
2. Drying method: It is mainly applied to the determination of moisture in solid samples, and the sample loses moisture by heating. This method is often used to determine most solid samples ( large samples need to be pulverized ) , the operation is relatively simple; but the following conditions are required: 1 does not contain bound water: 2 moisture is the only volatile substance; 3 other components in the sample are caused by heat The chemical changes are negligible; the disadvantages are lower precision and are not suitable for measuring liquids, gases, and volatiles.
3. Distillation method: The water-insoluble organic solvent and the sample are heated in a distillation type moisture measuring device to separate the moisture in the sample, and the water content can be calculated from the amount of water distilled. The method is simple and inexpensive, but has the following disadvantages: 1 water and organic solvent are prone to emulsification; 2 the moisture in the sample may not be completely evaporated; 3 moisture is sometimes attached to the wall of the condensation tube, causing reading error ; 4 except water, there are large amounts of volatile substances. Therefore, the precision is low, the error is large, and the measurement time is long, which is suitable for samples with low moisture content accuracy and small measurement frequency.
4. Karl Fischer method: It can be applied to the determination of water content in most inorganic compounds and organic compounds. The Karl Fischer moisture analyzer has been improved for many years and is divided into Karl Fischer titration and Karl Fischer Coulometric. The Karl Fischer titration moisture analyzer is mainly used to determine samples with high water content. Samples with lower water content are less than ideal and the operation is relatively complicated. The Karl Fischer Coulometric Moisture Analyzer is suitable for any sample with water content. It is especially good at measuring low water content samples. It has the advantages of simple operation, accurate measurement and stable performance. It can quickly measure liquid, solid and gas. The moisture content is recognized by the world as the accurate chemical method for measuring the moisture content of the material. It is a common industry standard analytical method and is widely used in petroleum, chemical, electric power, medicine, pesticide industry and scientific research institutions.
Ginger (Zingiber officinale Roscoe) is a fresh rhizome of perennial herb (40 ~ 100cm high) of ginger family and ginger genus. Varieties are: Weifeng ginger, Shandong Changyi face ginger, Qingzhou bamboo root ginger, Shannong No. 1 ginger, Qingzhou small yellow ginger.
The aliases are ginger root, hundred spicy cloud, hook finger, yindixin, Yanliang boy, fresh ginger and honey roasted ginger. The rhizome (dried ginger), cork (ginger peel) and leaf (ginger leaf) of ginger can be used as medicine.
Perennial herb, 50 ~ 100 cm high. The rhizome is fleshy, oblate, transverse, branched, with aromatic and spicy smell. The root block can be used as medicine. Dig in summer, remove stems, leaves and fibrous roots, and wash the soil.
Ginger contains spicy and aromatic ingredients. The pungent ingredient is a kind of "gingerone" in aromatic volatile oil. Among them, mainly ginger oil terpene, water fennel, camphor terpene, gingerol, eucalyptus oil essence, starch, mucus, etc. The edible part is 95%.
Fresh Ginger,Eating Raw Ginger,Minced Ginger To Ground Ginger,Fresh Ginger To Ground Ginger
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