摘要
利用聚乙二醇 2 0 0 0 (PEG) (NH) 2 SO4 萃取剂 (铜试剂 )双水相体系 ,采用液 液萃取的方法 ,研究了PEG相、单纯水相中金属离子络合物及萃取剂的光谱行为 ,探讨了金属离子络合物在PEG相中存在形态及萃取机理。同时实验了在不同酸度 ,不同盐用量 ,不同萃取剂用量 ,以及在不同表面活性剂的影响下 ,铜、镧、铀、铈的萃取率 ,通过控制一定条件 ,实现了Cu(Ⅱ )与La(Ⅲ ) ,Cu(Ⅱ )与Ce(Ⅳ )之间的定量萃取分离。
In polyethylene glycol 2000(PEG)-(NH 4) 2SO 4-extractant(sodium diethyldithiocarbamate, DDC) two-phase aqueous systems, spectroscopic behaviour of complexes of Cu(Ⅱ), La(Ⅲ), U(Ⅵ) and Ce(Ⅳ) with DDC as the extractant in PEG phase and general water phase was investigated. Comparing to DDC spectrophotometry, the new method has the advantage that the maximum wavelength of complex of Cu(Ⅱ) shifts to red wavelength. Extraction mechanism and existing form of complexes of metal ions in PEG phase were studied. Effects of different acidity, quantities of DDC and salt, different surfactant on the extraction efficiency of copper(Ⅱ), lanthanum(Ⅲ), uranium(Ⅵ) and cerium(Ⅳ) were discussed. Experimental results show that Cu(Ⅱ) was almost completely extracted in PEG phase at pH 5-8, U(Ⅵ) was partly extracted at pH 1-11, while La(Ⅲ) and Ce(Ⅳ) were not extracted at pH 3-6 buffer solution. So, extraction separation of Cu(Ⅱ)-La(Ⅲ) and Cu (Ⅱ)-Ce (Ⅳ) was carried out by control ling the solution acidity.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2004年第12期1637-1639,共3页
Spectroscopy and Spectral Analysis
基金
安徽省教育厅自然科学基金 (2 0 0 1kj1 95)资助项目
