Study on Separation/enrichment of Bismuth Using Microcrystalline Thymolphthalein Loaded with Diacetydioxime

摘要

A novel method for the separation/enrichment of trace Bi~(3+) using microcrystalline thymolphthalein loaded with diacetydioxime was established. The effects of different parameters on the enrichment yield of Bi~(3+) have been investigated. The possible enrichment mechanism of Bi~(3+) was discussed. The results showed that under the optimum conditions, in diacetydioxime (DMG)-thymolphthalein (TP) system, the chelate settlement of [Bi(DMG)_2] which formed by Bi~(3+) and DMG was quantitatively adsorbed on the surface of microcrystalline thymolphthalein, and the liquid-solid phases were formed with clear interface, while Cd~(2+),Zn~(2+) and Mn~(2+) could not be adsorbed. The quantitative separation of Bi~(3+) from those metal ions was achieved. A new method for the separation enrichment of trace Bi~(3+) was established. The proposed method has been successfully applied to the quantitative separation of trace Bi~(3+) in the samles of synthetic water, and the enrichment yield was 94.4%～100.9%.