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本文用两相滴定法测定了15°、20°、25°、35℃时2-噻吩甲酰三氟丙酮(HTTA)和甲基膦酸二甲庚酯(P_(350))协同萃取三价稀土离子,生成协萃络合物RE(TTA)_3(P_(350))_2的稳定常数(RE表示La、Ce、Pr、Nd、Sm、Eu、Gd七种稀土离子)。按反应式 RE~(3+)+3TTA~-+2P_(350)=RE(TTA)_3(P_(350))_2计算出热力学函数△H°、△G°和△S°之值,并对反应的△H°、△G°、△S°随原子序数的变化进行了讨论。
In this paper, two-phase titrimetric method was used to determine the synergistic effect of trimethylammonium bromide (TEA) and trimethylammonium bromide (HTTA) and dimethoxyheptyl methylphosphonate (P_ (350)) at 15 °, 20 °, Rare earth ions to generate a stable constant of RE (TTA) _3 (P_ (350)) _ 2 (RE represents seven rare earth ions of La, Ce, Pr, Nd, Sm, Eu and Gd). The thermodynamic functions ΔH °, ΔG ° and ΔS ° are calculated according to the equation RE ~ (3 +) + 3TTA ~ - + 2P ~ (350) = RE (TTA) _3 (P_ (350)) _ The changes of △ H °, △ G ° and △ S ° of the reaction with atomic number are discussed.