〈銪(Ⅲ)/HNO3/N7402HTTA 〉及〈釓(Ⅲ)/HNO3/N7402HTTA 〉協同萃取的體系

〈銪(Ⅲ)/HNO₃/_{N₇₄₀₂}^HTTA 〉及〈釓(Ⅲ)/HNO₃/_{N₇₄₀₂}^HTTA 〉協同萃取的體系

摘要: 本文報導了HTTA和N₇₄₀₂混合萃取劑萃取銪(Ⅲ)和釓(Ⅲ)的協同效應。分別測定了HTTA與N₇₄₀₂單獨萃取,以及HTTA和N₇₄₀₂混合萃取劑協同萃取的最佳條件以及銪(Ⅲ)與釓(Ⅲ)的分離因數,這兩個元素的協萃合物為離子締合物,其穩定性呈現"倒序"現象。以斜率分析法測出協萃合物的組成可能為(R₃NCH₃)~-,﹝Eu(TTA)₃NO₃﹞~-及(R₃NCH₃)~+·﹝Gd(TTA)₃NO₃﹞~-,討論了協萃體系的機理。

Abstract: 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 "nverted 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.