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本文提出了一个库仑滴定毫克量铂的方法。实验在含有硫酸铜的HCl 介质中进行,铂阴极电生CuCl_2~-还原滴定PtCl_6~(2-),终点用电位法检测。实验结果证明,最适宜的电解质溶液为0.25N HCl+0.04M CuSO_4·5H_2O,允许工作电极的电流密度≤5毫安/厘米~2。若改变工作电极极性,还有可能电生Cl_2对PtCl_4~(2-)进行氧化滴定。拟定的库仑滴定铂的方法操作简便,精密度和准确度都很高。
This article presents a Coulometric titration method for milligrams of platinum. The experiments were carried out in HCl medium containing copper sulfate, and PtCl_6 ~ (2 -) was electroporated by platinum cathode, and the end point was detected by potentiometry. Experimental results show that the most suitable electrolyte solution is 0.25N HCl + 0.04M CuSO 4 · 5H 2 O, allowing the working electrode current density ≤ 5 mA / cm ~ 2. If the working electrode polarity is changed, it is also possible that the Cl 2 oxidizes the PtCl_4 ~ (2-) electronically. The proposed Coulometric titration of platinum is simple, precise and accurate.