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本文描述了用精密库仑滴定法电产生银离子测定氯离子的方法,采用纯度为99.999％的银片作阳极,铂网作阴极,用Ag_2S离子选择电极作为指示电极,参考电极为217型双盐桥甘汞电极。氯化钠采用固体称样,加样前加入少量蒸馏水使之溶解,在电解过程中分步加样。这样既防止了实验中产生的银离子向阴极扩散,又避免了由于固体加样造成氯化银的沉淀包藏氯化钠引起的误差。在称样量为0.2克、0.3克、0.4克、0.5克的情况下,其纯度值分别平均为100.002％、99.998％、99.999％和100.000％,这表明测得的纯度值的一致性很好。
In this paper, a method for the determination of chloride ions by silver ion was developed by using precision Coulometric titration method. The purity of 99.999% silver was used as anode, platinum mesh as cathode, Ag_2S ion selective electrode as indicator electrode, reference electrode was 217 double salt Bridge calomel electrode. Sodium chloride using a solid sample, adding a small amount of distilled water before adding to dissolve in the electrolysis process step sample. This will not only prevent the silver ion generated in the experiment from diffusing to the cathode, but also avoid the error caused by the precipitation of silver chloride due to the solid addition of sodium chloride. The purity values were 100.002%, 99.998%, 99.999% and 100.000%, respectively, on a nominal scale of 0.2 g, 0.3 g, 0.4 g, 0.5 g, indicating good agreement of the measured purity values .