定電位電解法の研究-9-

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EDTA has been used for electrolysis of copper and good results have been obtained to make lustrous and quantitative deposit of copper. Measurements of the deposition potentials of copper and bismuth at a rotating platinum electrode and the half-wave potentials of them at a dropping mercury electrode from their EDTA solutions of various pH values have been made. The optimum quantity of EDTA, the pH value, the cathode potential, the anodic depolarizer, and the permissible quantity of bismuth have been tested for separation of copper from bismuth and the following procedure has proved to give good results. A sample solution containing copper and bismuth is treated with 2-3times moles as much EDTA against the copper plus bismuth, 1g ammonium nitrate and 1.5 g hydroxylamine hydrochloride are added, the solution is diluted with water to 140ml whose pH is adjusted to 3.1, and electrolyzed at 6070°C, with the cathode potential kept at -0.41V. vs. S. C. E. automatically. The results indicated that copper can be electrolyzed quantitatively in the presence of less than 1.2g bismuth, while that with 1.3g bismuth the trifle error of +0.50.6mg comes out.
社団法人日本分析化学会の論文