摘要
利用磷酸三丁酯 (TBP)对铱 (Ⅳ )氯水配合物 ( [Ir(H2 O) nCl6 -n]n - 2 ,n =1 ,2 ,3)在HCl介质中的萃取行为进行了研究 ,考察了不同萃取剂和介质组成等因素对萃取分配比的影响。揭示这些物种在HCl介质中可萃性难易程度的变化规律 ,证实H2 SO4具有促萃作用而HClO4起抑萃作用。通过对铱 (Ⅳ )氯水配合物经TBP萃取后所得水相、有机相的紫外-可见光谱的表征 。
The extraction behavior of aqua-chloroiridate(Ⅳ) complexes in the HCl solution is investigated with tributy1 phosphate(TBP) and trialkyl phosphine oxide(TAPO) as the extractants respectively.The influence of H 2SO 4 and HClO 4 on the extraction distribution ratios(D) of these complexes is also discussed.The results show that the distribution curves of all complexes raise at the beginning stage and then decline with increasing HCl concentration,and a peak in the 3～6 mol/L HCl concentration range occur,the sequence of D is [Ir(H 2O) 2Cl 4] 0>[Ir(H 2O)Cl 5] -> 2- >[Ir(H 2O) 3Cl 3] + at the low HCl concentration(<3 mol/L),and [Ir(H 2O)Cl 5] ->[Ir(H 2O) 2Cl 4] 0> 2- >[Ir(H 2O) 3Cl 3] + at the high HCl concentration([HCl>3 mol/L)[BFQ];H 2SO 4 promotes their extraction,but HClO 4 restrains their extraction;and the more water molecule numbers in the complex,the more difficult to extract it with strong polar solvent.On the basis of the characterization of UV-and IR-spectra of extracted aqueous and organic phases,it is evident that the extraction mechanism for aqua-chloroiridate(Ⅳ)complexes belong to solvating extraction mechanism.
出处
《贵金属》
CAS
CSCD
2001年第3期1-7,共7页
Precious Metals
基金
国家自然科学基金资助项目 ( 2 97310 31)
