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双水相体系中Cu(Ⅱ),La(Ⅲ),U(Ⅵ),Ce(Ⅳ)光谱行为及萃取分离
引用本文:邓凡政,魏迎,陈影,石影.双水相体系中Cu(Ⅱ),La(Ⅲ),U(Ⅵ),Ce(Ⅳ)光谱行为及萃取分离[J].光谱学与光谱分析,2004,24(12):1637-1639.
作者姓名:邓凡政  魏迎  陈影  石影
作者单位:淮北煤炭师范学院化学系,安徽,淮北,235000
基金项目:安徽省教育厅自然科学基金(2001kj195)资助项目
摘    要:利用聚乙二醇2000(PEG)-(NH)2SO4-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。

关 键 词:双水相体系  光谱行为          萃取剂  聚合物  金属离子络合物  萃取分离方法
文章编号:1000-0593(2004)12-1637-03
修稿时间:2003年2月16日

The Spectroscopic Behaviour and Extraction Separation of Cu(Ⅱ),La(Ⅲ),U(Ⅵ) and Ce(Ⅳ) in Two-Phase Aqueous Systems
DENG Fan-zheng,WEI Ying,CHEN Ying,SHI Ying.The Spectroscopic Behaviour and Extraction Separation of Cu(Ⅱ),La(Ⅲ),U(Ⅵ) and Ce(Ⅳ) in Two-Phase Aqueous Systems[J].Spectroscopy and Spectral Analysis,2004,24(12):1637-1639.
Authors:DENG Fan-zheng  WEI Ying  CHEN Ying  SHI Ying
Institution:Department of Chemistry, Huaibei Coal Teachers' College, Huaibei 235000, China.
Abstract:In polyethylene glycol 2000 (PEG)-(NH4)2 SO4-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 controlling the solution acidity.
Keywords:Two-phase aqueous  Spectroscopic behaviour  Copper  Lanthanum  Uranium  Cerium
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