HTTA与中性磷萃取剂协同萃取Eu(Ⅲ)的稀释剂效应

STUDY ON THE EFFECT OF DILUENTS ON THE SYNERGISTIC EXTRACTION OF Eu(Ⅲ) WITH 2 THENOYLTRIFLUOROACETONE AND NEUTRAL ORGANOPHOSPHORUS EXTRACTANTS

研究了Eu(Ⅲ ) 2 噻吩甲酰三氟丙酮 (HTTA)二元萃合物在不同稀释剂中与中性磷萃取剂 (S)的加合行为。结果表明 :Eu(HTTA) 3与磷酸三丁酯 (TBP)和三辛基氧化膦 (TOPO)均可形成组成为Eu(HTTA) 3·S和Eu(HTTA) 3·2S的加合物 ,且其加合反应平衡常数K1S、K2S和KS 与稀释剂溶度参数δ之间均有良好的线性关系 ,δ是影响加合过程的重要因素。

The adduct behavior of Eu(Ⅲ) 2 thenoyltrifluoroacetone(HTTA) complex with neutral organophosphorus extractants(S),i.e.,tributyl phosphate(TBP) and tri n octyl phosphine oxide(TOPO),has been studied in thirteen diluents at 25.2℃.The results show that the adduct formations of Eu(HTTA) 3·S and Eu(HTTA) 3·2S are formed by Eu(HTTA) 3 and TBP or TOPO in extraction process,and the linear relationship between the adduct formation constants K S, K 1S and K 2S and the solubility parameter ( δ ) is satisfactory in given conditions.The solubility parameter is a main reason effecting the adduct formation in organic phase.