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详细研究了 Ag-AgI 膜电极阴极发生碘离子的电流效率同制备电极的各种条件和滴定介质之间的关系,根据膜的表面性质解释了产生系统滴定误差的原因并找到了获得电生碘离子100%或接近100%电流效率的最佳条件。应用电极产生的碘离子滴定了不同物料中的少量银,并研究了指示终点的各种方法。方法简便,测定银的准确度高,大量共存离子不干扰或能借 EDTA 掩蔽而消除其干扰。
The relationship between the current efficiency of iodide ions in the cathode of Ag-AgI membrane electrode and the conditions of preparing the electrode and the titration media was studied in detail. The reason for the titration error of the system was explained based on the surface properties of the membrane. Ion 100% or near 100% current efficiency of the best conditions. The iodide produced by the electrode titrated a small amount of silver in different materials and investigated various ways of indicating the end point. The method is simple and convenient, the accuracy of the determination of silver is high, a large number of coexisting ions do not interfere or can be masked by EDTA to eliminate the interference.