Br-PADAP金属螯合物的萃取——Ⅰ.Br-PADAP二价金属螯合物的萃取

Solvent Extraction of Metal Chelates with Br-PADAP——Ⅰ.Solvent Extraction of Divalent Metal Chelates with Br-PADAP

系统研究了乙酸正丁酯萃取Br-PADAP 二价金属螯合物.提出萃取光度法测定Br-PADAP 的分配常数和二聚常数.用连续变化法和平衡移动法测定Fe^(2+)、Co^(2+)、Ni^(2+)、Zn^(2+)、Cd^(2+)、Hg^(2+)、Sn^(2+)、Pd^(2+)的Br-PADAP 螯合物萃取常数.提出低化学计量法测定Pt^(2+)Br-PADAP 螫合物的萃取常数.比较所得结果,观察到用乙酸正丁酯萃取提高了Br-PADAP与金属离子反应的选择性,且可用Br-PADAP 螯合萃取分离不同价态的金属离子.

Systematic study of the solvent extraction of divalent metal chelates withBr-PADAP from 0.16M NaClO_4 into n-butyl acetate is presented.An extraction-spectrophotometric method was recommended for determination of dimerizationconstant and distribution coefficient of Br-PADAP.The solvent extractionconstants of Fe、Co、Ni、Zn、Cd、Hg、Sn、Pd chelates with Br-PADAP weredeterminated by the means of continuous variation and shifting equilibria(thatis Logarithmic Method of Bent and French).A substoichiometric method hasbeen worked out for determination of extraction constant of Pt chelate withBr-PADAP.Compared with the results obtained,it was observed that the selectivity ofreaction of Br-PADAP with metal ions was increased with extraction into n-butyl acetate and it is possible to separate different valent metal ions by solv-ent extraction of Br-PADAP Chelates.