TTA-ピリジン塩基による亜鉛(II)とカドミウム(II)の協同抽出分離

概要

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The extraction procedure for the separation of zinc (II) from cadmium(II) is as follows: Twenty ml of the aqueous solution (pH=5.7) is equilibrated with the equal volume of 5×10^<-3>M 2-thenoyltrifluoroacetone (TTA=Htta) and 5×10^<-2>M 2,6-lutidine in carbon tetrachloride by shaking the mixture for 5 min. Only zinc is selectively extracted into the organic phase. The synergistic effect caused by pyridine(py) could be explained through the formation of an adduct, Zn(tta)_2(py)_2 or Cd(tta)_2(py)_2. On the other hand, the main synergistic adduct formed by using 2, 6-lutidine was found to be Zn(tta)_2(2,6-lut.). The difference in the composition of adducts in the above cases is attributable to the steric effect of methyl groups in 2, 6-lutidine. Thc steric effects by the presence of other ortho-substituents of pyridine were also studied.
1977-03-05