| 修饰聚合物液-固亲和萃取体系分离钪与钕及机理探讨 |
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| 引用本文： | 胡景,孙小梅,察冬梅,李步海.修饰聚合物液-固亲和萃取体系分离钪与钕及机理探讨[J].分析化学,2004,32(7):912-915. |
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| 作者姓名： | 胡景 孙小梅 察冬梅 李步海 |
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| 作者单位： | 中南民族大学化学与生命科学学院,武汉,430074;中南民族大学化学与生命科学学院,武汉,430074;中南民族大学化学与生命科学学院,武汉,430074;中南民族大学化学与生命科学学院,武汉,430074 |
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| 基金项目： | 国家自然科学基金资助项目 (No .2 9475 2 19) |
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| 摘 要： | 研究了加修饰聚合物(PEG-IDA)的吐温(Tween)80-盐水液-固体系亲和萃取稀土(RE)离子时体系酸度对萃取率的影响，并控制萃取酸度实现了Sc与Nd的定量分离，平均回收率Sc：99．72％；Nd：100.88％。测定新络合物的稳定常数，两者相差4倍，是分离的原因。对该体系分离Sc与Nd的机理进行探讨表明，RE-PEG-IDA络合物主要是与Tween 80形成了氢键。
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| 关 键 词： | 修饰聚合物 亲和萃取 稳定常数 稀土 |
The Affinity Extraction Separation of Scandium-Neodymium by Modified Polymer and the Discussion of Mechanism |
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| Hu Jing,Sun Xiaomei,Cha Dongmei,Li Buhai.The Affinity Extraction Separation of Scandium-Neodymium by Modified Polymer and the Discussion of Mechanism[J].Chinese Journal of Analytical Chemistry,2004,32(7):912-915. |
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| Authors: | Hu Jing Sun Xiaomei Cha Dongmei Li Buhai |
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| Institution: | Hu Jing,Sun Xiaomei,Cha Dongmei,Li Buhai * |
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| Abstract: | When rare earth (RE) ions were extracted in Tween 80-salt-H_2O liquid-solid affinity extraction system with modified polymer,polyethylene glycol-iminodiacetic acid (PEG-IDA),the effect of the acidity on E % (percentage of extraction) was studied. The quantitative separation of Sc-Nd was carried out by controlling the acidity. The average recovery for Sc,Nd was 99.72%,100.88% respectively. The stability constants of the new coordination compounds were determined and the difference among them was the reason for separation. The mechanism of separation of Sc-Nd by such a system was discussed. It shows that the hydrogen bonding between the RE-PEG-IDA compound and Tween 80 is formed mainly. |
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| Keywords: | Modified polymer affinity extraction stability constant rare earth |
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