在聚乙烯吡咯啉酮-盐-水的液-固萃取体系中溴络阴离子的萃取行为

The Partition Behaviour of Bromide Complex Anions in Liquid-Solid Extraction System of Polyvinylpyrrolidone-Salt-Water

本文研究了在聚乙烯吡咯啉酮（PVP）－盐－水的液－固萃取体系中，Au（Ⅲ）、Bi（Ⅲ）、Zn（Ⅱ）和Fe（Ⅲ）与Br形成的络阴离子，在两相间的分配行为。在硫酸和盐酸介质中，Au（Ⅲ）有很高的萃取率，Fe（Ⅲ）的萃取率很低，而Bi（Ⅲ）和Zn（Ⅱ）的萃取率则受溶液的酸度、NH；Br的浓度及溶液介质的影响。在硫酸介质中，通过控制溶液的酸度和NH4Br的浓度，实现了Bi（Ⅲ）－Fe（Ⅲ）、Au（Ⅲ）－Zn（Ⅱ）及Au（Ⅲ）－Fe（Ⅲ）等的定量萃取分离与测定。

In the liquid-solid extraction system of polyvinylpyrrolidone-salt-water, the distribution between two phases of the complexes of Au(Ⅲ), Bi(Ⅲ),Zn(Ⅲ) and Fe(Ⅲ) with Br was investigated. In the media of H2SO4 and HCl, the percentage of extraction (E% ) of Au (Ⅲ ) is highest, the E% of Fe(Ⅲ ) is lowest, and the E% of Bi(Ⅲ ) and Zn(Ⅱ) is affected by the medium, acidity of the solutions and the concentration of NH4Br. In the H2SO4 medium. the quantitative extraction separation and determination of Bi (Ⅲ)-Fe (Ⅲ ),Au (Ⅲ )-Zn(Ⅱ) and Au (Ⅲ )-Fe(Ⅱ) were achieved by controlling the acidity of the solution and concentration of NH4Br.