聚乙二醇双水相萃取光度法测定铼

Extraction spectrophotometric determination of Re(Ⅶ) in polyethylene glycol aqueous two-phase system

研究了聚乙二醇双水相体系中,金属离子络合物及萃取剂的光谱行为,研究了酸度、缓冲溶液用量、盐用量、萃取剂用量及表面活性剂对萃取铼的影响,并通过控制一定条件,可实现了混合离子的分离。

In polyethylene glycol2000 （PEG）-（ NH4 ）2SO4-Crystal Violet two-phase aqueous systems, spectroscopic behaviour of complex of Re（VII） with Crystal Violet as the extractant in PEG phase and general water phase was investigated. Comparing to Crystal violet spectrophotometry,The new method has the advantage that the maximum wavelength of complex of Re（VII） shifts to red wavelength. Extraction mechanism and existing form of complexes of metal ions in PEG phase were studied. Effects of different acid- ity, quantities of Crystal Violet and salt, different surfactant on the extraction efficiency of Re（VII） was discussed. Experimental results show that Re（VII） was almost completely extracted in PEG phase at pH 6. 864. extraction separation of Re（VII） and Mo（VI） was carried out by adding the masking agent.