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用抗坏血酸可代替亚铁盐滴定锰,通常是在磷酸介质中以二苯胺磺酸钠作指示剂,由红紫色变为黄色为终点。干扰元素为高价的变价元素铬、钒、钴等,但锰矿中很少含上述元素、故可用来滴定锰矿中锰。主要试剂0.01mol/L抗坏血酸标准溶液:称取1.5g抗坏血酸溶于水中,加入200mL无水乙醇,稀释至1L,摇匀,储于棕色瓶中。使用时以锰矿标样标定。分析步骤称取0.1000g试样置于250mL锥形瓶中,加入5mL盐酸,加热溶解5—10min钟后加入10mL磷酸、3mL硝酸,加热至刚冒白烟,趁热加入1g硝酸铵,摇匀,驱除红棕色气体,稍冷。以50mL
Ascorbate can replace ferrous salt titration manganese, usually in the phosphoric acid medium to diphenylamine sulfonate as an indicator, from purple to yellow as the end point. Interfering elements for the price of the elements of the price of chromium, vanadium, cobalt, etc., but rarely contained in manganese ore above elements, it can be used to titrate manganese manganese. The main reagent 0.01mol / L ascorbic acid standard solution: Weigh 1.5g ascorbic acid dissolved in water, add 200mL of anhydrous ethanol, diluted to 1L, shake, stored in a brown bottle. Use manganese standard calibration. Analysis step Weigh 0.1000g sample placed 250mL conical flask, add 5mL hydrochloric acid, dissolved 5-10min heating 10mL phosphoric acid, 3mL nitric acid, heated to just take white smoke, while hot 1g of ammonium nitrate, shake , Get rid of reddish brown gas, slightly cold. Take 50mL