<報文>アメリシウムのTTA, オキシンおよびクペロンキレートのホスフィンオキシドとの協同効果抽出

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The effect of solvent on the synergic extraction of americium (III) was studied with a combination of chelating extractants (HA) and neutral ligands (S). The distribution ratio between a number of inert solvents and dilute perchloric acid solution was determined by the γ-counting rate of ^<241>Am. Thenoyltrifluoroacetone (TTA) and cupferron chelates of americium form two types of synergic adducts, AmA_3・S and AmA_3・2S, with triphenyl phosphine oxide (TPPO) and trioctyl phosphine oxide (TOPO), while 8-hydroxyquinoline (oxine) chelate forms only a 1 : 1 complex, AmA_3・S. The adduct formation constants decrease in the order, TTA>cupferron>oxine chelates. The magnitude of the formation constants (K_<s, m>) of these synergic adducts is much affected by the kind of solvent ; variations in the log K_<s, m>, values are related to the solubility parameter of organic solvent (δ_<org>) by the linear relationship, log K_<s, m>=2Bδ_<org>+constant, where B is a negative constant.
東北大学の論文
1979-09-22