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本文报导用两相滴定法研究HPZL和TBP的苯溶液对Pb~(++)、Ni~(++)、Mn~(++)、Co~(++)、Ca~(++)、Mg~(++)、Cd~(++)、La~(+++)诸离子的萃取和协同萃取机理得到的结果。 1.确定了有关萃合物和协萃络合物的组成和相应的平衡常数。 2.实验表明,萃取作用比较强的金属离子,协萃效应比较弱;而萃取作用比较弱的金属离子协萃作用则较强。所以,萃取性能比协萃性能更反映出金属离子之间的差异。 3.发现配位数和配位键的共价性之间有以下关系:若配位键的共价性较强,则配位数倾向于取较小的值,协同效应较弱;若配位键的离子性较强,则配位数倾向于取较大的值,协萃效应较强。
In this paper, two-phase titration was used to study the effect of benzene solution of HPZL and TBP on Pb ~ (++), Ni ~ (++), Mn ++, Co ++, Ca ++, Mg ~ (++), Cd ~ (++), La ~ (+++) ion extraction and synergistic extraction mechanism. 1. The composition and corresponding equilibrium constants for the relevant compounds and the complexing complex are determined. Experiments show that the stronger the extraction of metal ions, the synergistic effect is relatively weak; and weak extraction of metal ions synergistic effect is stronger. Therefore, the extraction performance more than synergistic performance reflects the difference between metal ions. It is found that there is the following relationship between the coordination number and the covalent bond: if the covalent bond is strong, the coordination number tends to take a smaller value and the synergistic effect is weaker; Ionic bond is stronger, then the coordination number tends to take a larger value, strong synergistic effect.