无色或白色结晶、颗粒或粉末,别名皓矾。无气味。味涩。在干燥空气中风化,280℃失去全部结晶水,500℃以上分解。1g溶于0.6ml水、2.5ml甘油,不溶于乙醇。水溶液对石蕊呈酸性,pH约4.5。含1分子结晶水的较不易结块。相对密度1.97。熔点100℃。最小致死量(大鼠,经口)2200mg/kg。有刺激性。用于制造立德粉,并用作媒染剂、收敛剂、木材防腐剂等。
硫酸锌、性能:无色晶体,小针状或粒状晶形粉末,无臭,在空气中会风化。溶液对石蕊呈酸性比重1.957(25/4℃),熔点100℃在280℃失去7H2O,溶于水及甘油,不溶于酒精,毒性底。
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质量指标SpecificationGB25579-2010FCC,1996含量w/% ZnSO4.H2OContentZnSO4.H2O99.0-100.598.0-100.5ZnSO4.7H2OZnSO4.7H2O99.0-108.799.0-108.7砷(As),mg/kg ≤As0.0003——碱金属和碱土金属盐w/%≤Alkali metal0.500.5酸度PH通过试验正常硒(Se),mg/kg ≤Se0.0030.003汞(Hg),mg/kg ≤Hg0.00010.0005铅(Pb),mg/kg ≤Pb0.00040.001镉(Cd),mg/kg ≤Cd0.00020.0005
1、ChemicalName: Zinc sulfate
2、Molecular Formula :ZnSO4.H2O, ZnSO4.7H2O
3、MolecularWeight:179.48(Monohydrate), 287.54(Heptahydrate)
4、CAS:7446-19-7(H2O);7446-20-0 (7H2O)
5、Character:It iscolorless 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℃.
6、Usage:It is used as food additives, animal feed, printing and dyeing, timber preservative.Used as analytical reagent.
7、Packing: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.
8、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.
在硫酸锌溶液中加入氯化铵和碘化钾消除铁等杂质的干扰,在PH值约5.5条件下以***酚橙为指示剂,用乙二胺四乙酸二钠标准液滴定。
详细步骤如下:
方法名称: 硫酸锌—硫酸锌的测定—络合滴定法。
应用范围: 该方法采用络合滴定法测定硫酸锌(ZnSO4·7H2O)的含量。
该方法适用于硫酸锌的含量测定。
方法原理: 取供试品适量,加水溶解,以铬黑T为指示剂,用乙二胺四醋酸钠滴定液(0.05mol/L)滴定至溶液自紫红色转变为纯蓝色。每1mL乙二胺四醋酸钠滴定液(0.05mol/L)相当于14.38mg的ZnSO4·7H2O,计算,即得。