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本文研究了在碱性介质中电生一价银作为库仑滴定剂的条件,实验结果表明,用金属银为发生阳极,在0.1N氢氧化钠溶液中,以0.2N氨作为电生银离子的络合剂,当电流密度在0.5—10毫安/厘米~2范围内,电生一价银的电流效率可以接近100％,用双银电极安培法指标终点,当指示阳极与指示阴极面识之比为2:1时.测定100—600微克氰的平均误差约为±0.2％,测定0.5微克氰时,误差为±2％。
In this paper, the conditions of electrogenerated monovalent silver as coulometric titrant in alkaline medium were studied. The experimental results show that with silver metal as the anode and 0.2N ammonia as the silver ion in 0.1N sodium hydroxide solution Complexing agent, when the current density in the range of 0.5-10 mA / cm ~ 2, the electric current efficiency of the electricity generation of monovalent silver can be close to 100%, with double silver electrode amp method index end point, when indicating the anode and indicating cathode surface knowledge Ratio of 2: 1. When measured 100-600 micrograms of cyanide average error of about ± 0.2%, measured 0.5 micrograms of cyanide, the error is ± 2%.