Studies on Metal Complex Species using an Anion Exchange Resin. III. Uranium(VI)-Nitrate Complex and Zinc-Chloride Complex
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1) The "indifferent electrolyte-adding" method described in previous papers was applied to the uranyl-nitrate and to the zinc-chloride complexes. A sodium nitrate-sodium perchlorate mixed medium was employed in the former, and a sodium chloride-sodium nitrate mixed medium in the latter.<BR>2) The predominant species of the uranyl-nitrate complex adsorbed from sodium nitrate solutions was UO<SUB>2</SUB>(NO<SUB>3</SUB>)<SUB>3</SUB><SUP>−</SUP> at the external nitrate concentration of about 2 M and UO<SUB>2</SUB>(NO<SUB>3</SUB>)<SUB>4</SUB><SUP>2−</SUP> at the 4∼6 M concentration. The coexistence of the two species may be presumed at 2∼4 M.<BR>3) The principal zinc-chloride complex adsorbed on the resin from the chloride solution of 0.4∼3 M was simply ZnCl<SUB>4</SUB><SUP>2−</SUP>, accompanied by a small quantity of ZnCl<SUB>3</SUB><SUP>−</SUP> in a low ionic strength. On the other hand, the predominant species in the aqueous phase were ZnCl<SUB>3</SUB><SUP>−</SUP> and ZnCl<SUB>4</SUB><SUP>2−</SUP> for a sodium chloride concentration of 3 M, and Zn<SUP>2+</SUP> and ZnCl<SUP>+</SUP> for a 0.4 M concentration. These results were approximately consistent with those obtained in a hydrochloric acid medium by other investigators.
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