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Introduce：
| Chemical name: | Zinc Sulfate | | Molecular formula: | ZnSO4.H2O,ZnSO4.7H2O | | Molecular weight: | 179.48(Monohydrate), 287.54(Heptahydrate) | | CAS NO: | 7446-19-7(H2O); 7446-20-0 (7H2O) | | Character: | It is colorless or white crystalline powder, odorlessness. Efflorescence in air. Acid hydrometer is 1.957(25/4℃) to litmus. Melting point is 100℃. It''s soluble in water and glycerol, insoluble in ethanol and light toxicity, lose crystal water in 280℃. | | Usage: | It is used as food additives, animal feed, printing and dyeing, timber preservative.Used as analytical reagent. | | Packaging: | It is packed with polythene bag as the inner layer, and a compound plastic woven bag as the outer layer. The net weight of each bag is 25kg. | | Storage and Transport: | It should be stored in a dry and ventilative warehouse; kept away form water and moisture during transport; unloaded with care, so as to avoid damage to bags. Furthermore, it should be stored separately from poisonous substances. | | Specification | GB25579-2010 | FCC,1996 | | Content w/% | ZnSO4.H2O | 99.0-100.5 | 98.0-100.5 | | ZnSO4.7H2O | 99.0-108.7 | 99.0-108.7 | | As,mg/kg ≤ | 0.0003 | - | | Alkali metal w/% ≤ | 0.50 | 0.5 | | PH | passed | qualified | | Se,mg/kg ≤ | 0.003 | 0.003 | | Hg,mg/kg ≤ | 0.0001 | 0.0005 | | Pb,mg/kg ≤ | 0.0004 | 0.001 | | Cd,mg/kg ≤ | 0.0002 | 0.0005 |
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