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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 this paper, the complex anions formed by Au (Ⅲ), Bi (Ⅲ), Zn (Ⅱ) and Fe (Ⅲ) with Br in the liquid-solid extraction system of polyvinylpyrrolidone (PVP) The distribution between the two phases. In sulfuric acid and hydrochloric acid medium, the extraction rate of Au (Ⅲ) is very high, the extraction rate of Fe (Ⅲ) is very low, and the extraction rate of Bi (Ⅲ) and Zn (Ⅱ) The concentration and the effect of the solution medium. The quantitative extraction of Bi (Ⅲ) -Fe (Ⅲ), Au (Ⅲ) -Zn (Ⅱ) and Au (Ⅲ) -Fe (Ⅲ) was achieved by controlling the acidity of the solution and the concentration of NH 4 Br in the sulfuric acid medium Separation and determination.