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本文研究1-苯基-3-甲基-4-苯甲酰基吡唑啉酮-5(PMBP)与丁基膦酸二丁酯(DBBP)或磷酸三丁酯(TBP)的氯苯溶液在硝酸介质中对Eu(Ⅲ)的协同萃取。测得了萃合物的组成为EuA_3·HA、EuA_3·2DBBP或EuA_3·2TBP。在18℃时的萃取平衡常数分别为: Eu~(3+)(<10~(-5)M)/HNO_3,NaNO_3/(μ=0.1)/PMBP-C_6H_5Cl体系 K_3=[EuA_3·HA]_0[H~+]~3/[Eu~(3+)][HA]_0~4=1.51×10~(-3) Eu~(3+)(<10~(-5)M)/HNO_3,NaNO_3(μ=0.1)/PMBP—DBBP—C_6H_5Cl体系 K_(s·e)=[EuA_3·2DBBP]_0[H~+]~3/[Eu~(3+)][HA]_0~3[B]_0~2=2.40×10~2 Eu~(3+)(<10~(-5)M)/HNO_3,NaNO_3(μ=0.1)/PMBP-TBP-C_6H_5Cl体系 K_(s·e)=[EuA_3·2TBP]_0[H~+]/[Eu~(3+)[HA]_0~3[B]_0~2=1.74×10~1 讨论了萃合物的结构及协同萃取的机理。
In this paper, the chlorobenzene solution of 1-phenyl-3-methyl-4-benzoylpyrazolone-5 (PMBP) and dibutylbutylphosphonate (DBBP) or tributyl phosphate Synergistic Extraction of Eu (Ⅲ) in Nitric Acid Medium. The composition of the complex was measured as EuA_3 · HA, EuA_3 · 2DBBP or EuA_3 · 2TBP. The extraction equilibrium constants at 18 ℃ were: Eu 3+ (<10 -5 M) / HNO 3, NaNO 3 / (μ = 0.1) / PMBP-C 6 H 5 Cl system K 3 = [EuA 3 · HA] (H 3 +)] [HA] _0 ~ 4 = 1.51 × 10 ~ (-3) Eu ~ (3 +) (<10 ~ (-5) M) NaNO_3 (μ = 0.1) / PMBP-DBBP-C_6H_5Cl system K_ (s · e) = [EuA_3 · 2DBBP] _0 [H ~ +] ~3 / [Eu ~ (3 +)] [HA] _0 ~ 3 [B ] _0 ~ 2 = 2.40 × 10 ~ 2 Eu ~ (3 +) (<10 ~ (-5) M) / HNO_3, NaNO_3 (μ = 0.1) / PMBP-TBP-C_6H_5Cl system K_ (s · e) = [ EuA_3 · 2TBP] _0 [H ~ +] / [Eu ~ (3 +) [HA] _0 ~ 3 [B] _0 ~ 2 = 1.74 × 10 ~ 1 The structure of the complex and the mechanism of the synergistic extraction were discussed.