無色或白色結(jié)晶、顆?;蚍勰?,別名皓礬。無氣味。味澀。在干燥空氣中風(fēng)化,280℃失去全部結(jié)晶水,500℃以上分解。1g溶于0.6ml水、2.5ml甘油,不溶于乙醇。水溶液對石蕊呈酸性,pH約4.5。含1分子結(jié)晶水的較不易結(jié)塊。相對密度1.97。熔點100℃。最小致死量(大鼠,經(jīng)口)2200mg/kg。有刺激性。用于制造立德粉,并用作媒染劑、收斂劑、木材防腐劑等。
硫酸鋅、性能:無色晶體,小針狀或粒狀晶形粉末,無臭,在空氣中會風(fēng)化。溶液對石蕊呈酸性比重1.957(25/4℃),熔點100℃在280℃失去7H2O,溶于水及甘油,不溶于酒精,毒性底。
蘋果公司今天在紐約股市收盤后發(fā)布了2016財年第三財季的財報,營收和利潤不出意外的下滑,不過因為總營收和每股收益超過了市場預(yù)期,蘋果股票在目前的盤后交易中上漲了7.21%,重回100美元以上。
質(zhì)量指標(biāo)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——堿金屬和堿土金屬鹽w/%≤Alkali metal0.500.5酸度PH通過試驗正常硒(Se),mg/kg ≤Se0.0030.003汞(Hg),mg/kg ≤Hg0.00010.0005鉛(Pb),mg/kg ≤Pb0.00040.001鎘(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.
在硫酸鋅溶液中加入氯化銨和碘化鉀消除鐵等雜質(zhì)的干擾,在PH值約5.5條件下以***酚橙為指示劑,用乙二胺四乙酸二鈉標(biāo)準(zhǔn)液滴定。
詳細(xì)步驟如下:
方法名稱: 硫酸鋅—硫酸鋅的測定—絡(luò)合滴定法。
應(yīng)用范圍: 該方法采用絡(luò)合滴定法測定硫酸鋅(ZnSO4·7H2O)的含量。
該方法適用于硫酸鋅的含量測定。
方法原理: 取供試品適量,加水溶解,以鉻黑T為指示劑,用乙二胺四醋酸鈉滴定液(0.05mol/L)滴定至溶液自紫紅色轉(zhuǎn)變?yōu)榧兯{(lán)色。每1mL乙二胺四醋酸鈉滴定液(0.05mol/L)相當(dāng)于14.38mg的ZnSO4·7H2O,計算,即得。