〈铕(Ⅲ)/HNO_3/HTTA N_(7402)}〉及〈钆(Ⅲ)/HNO_3/HTTA N_(7402)}〉协同萃取的体系

Study on the Synergistic Extraction in the Systems of "Eu(Ⅲ)/HNO_3/(N7402HTTA)} " and"Gd(Ⅲ)/HNO_3/(N7402HTTA)}

本文报导了HTTA和N_(7402)混合萃取剂萃取铕(Ⅲ)和钆(Ⅲ)的协同效应。分别测定了HTTA与N_(7402)单独萃取,以及HTTA和N_(7402)混合萃取剂协同萃取的最佳条件以及铕(Ⅲ)与钆(Ⅲ)的分离因数,这两个元素的协萃合物为离子缔合物,其稳定性呈现“倒序”现象。以斜率分析法测出协萃合物的组成可能为(R_3NCH_3)^-,[Eu(TTA)_3NO_3]^-及(R_3NCH_3)^+·[Gd(TTA)_3NO_3]^-,讨论了协萃体系的机理。

In this paper, the synergism in the extraction of Europium(Ⅲ) and Gadolinium (Ⅲ) with the mixed extractants of thenoyltrifluoroacetone (HTTA) and trialkylmethylammonium nitrate (N7402) has been reported. The optimun conditions of the HTTA-extraction, N7402-extraction and,HTTA N7402}-synergistic extraction have been determined. The separation factors of europium and gadolinium in these systems have been determined also. The extractable species of europium (Ⅲ) and gadolinium (Ⅲ) from synergislic extraction are ion-associated pairs and their stabilities exhibit the 'inverted ordinal phenomenon'. From the method of slope-analysis, the compositions of these two extractable species are probably(R3NCH3)+·[Eu (TTA)3NO3]- and (R3NCH3) + ·[Gd(TTA) 3NO3) -. The mechanism of the synergistic extraction in these two systems has been discussed.