电解分析测定银铜,一般均需在恒电位,即控制外加电压的条件下,进行电解,操作繁琐。Charlot等提出借助辅助体系,稳定电极电位的方法,例如加一种试剂到电解溶液中,用以稳定电极电位,阻止干扰离子的沉积,而不影响待测物质的沉积。三价铁盐能稳定电极电位分离银、铜,在一定的电流之下,首先还原的是Ag~+,然后是Fe~(3+),而cu~(2+)不被还原。如果需要在同一溶液中电解测定银铜时,三价铁盐的存在是不合适的,因为 Electrolytic analysis of silver and copper, are generally required at a constant potential, that is, under the control of the applied voltage, electrolysis, cumbersome operation. Charlot et al. Proposed a method of stabilizing the electrode potential with an auxiliary system, for example, adding a reagent to the electrolytic solution to stabilize the electrode potential and prevent the deposition of interfering ions without affecting the deposition of the substance to be measured. Ferric salts can stabilize the electrode potential to separate silver and copper. Under a certain current, Ag ~ +, then Fe ~ (3+), and Cu ~ (2+) are not reduced at first. If it is necessary to electrolyze silver-copper in the same solution, the presence of ferric salts is not suitable because