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1.亚铁氰化钾的沉淀反应可用双铂极电流滴定法指示终点,外加电压以50毫伏为宜。 2.在1M盐酸溶液中,亚铁氰化钾可使锌定量的沉淀为Zn_3K_2[Fe(CN)_6]_2,而镉不干扰。在同一溶液中加入固体硫酸铵使浓度达0.9-1.2M,则可使镉定量的沉淀为Cd_5(NH_4)_6[Fe(CN)_6]_4。 3.根据以上实验结果,拟定锌镉共存时的同时测定方法,并应用於海绵镉的分析得到满意的结果。
1. Potassium ferrocyanide precipitation reaction can be double platinum current titration end point, the applied voltage to 50 millivolts is appropriate. In 1 M hydrochloric acid solution, potassium ferrocyanide can precipitate zinc as Zn_3K_2 [Fe (CN) _6] _2, while cadmium does not interfere. In the same solution by adding solid ammonium sulfate concentration of 0.9-1.2M, the quantitative precipitation of cadmium can make Cd_5 (NH_4) _6 [Fe (CN) _6] _4. According to the above experimental results, the simultaneous determination method of zinc and cadmium coexistence was drawn up, and the satisfactory results were obtained when the analysis of sponge cadmium was carried out.