Kinetics of Complexation Reactions at Surfaces and in Solution: Implications for Enhanced Radionuclide Migration
Kinetics of Complexation Reactions at Surfaces and in Solution: Implications for Enhanced Radionuclide Migration
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DOI：
10.1524/ract.1994.6667.special-issue.63
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
J. Hering;S. Kraemer
中科院分区：
文献类型：
--
作者：
J. Hering;S. Kraemer
在若干废物处置场观察到放射性核素的流动性增强;放射性废物往往含有强有机络合剂作为共同污染物。矿物-水界面的吸附是放射性核素可能固定在地下环境中的反应类型之一。对于以有机络合形式引入到地下的污染物金属，这种固定需要吸附完整的络合物或从络合物中置换污染物金属。与溶液中络合反应的比较表明，在碎片的情况下，污染物金属的固定可能受到动力学限制。在溶液中的络合反应的机制，并在表面的比较讨论作为背景检查的实验室研究的竞争和共吸附和金属流动性的实地研究。
Enhanced mobility of radionuclides has been observed at several waste disposal sites; radioactive wastes have often contained strong, organic complexing agents as co-contaminants. Adsorption at mineral-water interfaces is one of the types of reactions by which radionuclides may become immobilized in the subsurface environment. For a contaminant metal introduced into the subsurface in organically-complexed form, such immobilization requires either adsorption of the intact complex or displacement of the contaminant metal from the complex. Comparison with complexation reactions in solution suggests that, in the tatter case, immobilization of the contaminant metal may be subject to kinetic limitations. A comparative discussion of the mechanisms of complexation reactions in solution and at surfaces serves as background for examination of laboratory studies of competitive- and co-adsorption and field studies of metal mobility.