液-液界面を利用した新しい電解共沈濃縮法

概要

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A preliminary experiment was carried out to concentrate minor element in sea water. An artificial sea water containing 0.5 M sodium chloride, 0.05 M magesium chloride and 70 ppb of iron was prepared. Two liters of the artificial sea water was put in contact with 500ml of isobutylalcohol. A stianless steel plate (18/8) with a diameter 14cm was placed in the alcohol phase at one centimeter abov the interface as the cathode and a platinum wire in the aqueous phase as the anode. The electrolysis was peformed for four hours at 80mA. Iron was quantitatively coprecipitated with magnesium hydroxide formed at the interface by the electrolysis. The precipitation contained 0.14mg of iron and 31mg of magnesium. On the other hand, 1800mg of magnesium has to be precipitated by ammonia water to collect 0.14mg of iron in the solution with a common coprecipitation method. In the present case, the adsorption of iron to the alcohol-water interface may have taken place and the coprecipitation occurs at the interface.
社団法人日本分析化学会の論文
1975-02-10