Sorption mechanism of trace amounts of divalent metal ions on a chelating resin containing iminodiacetate groups
Sorption mechanism of trace amounts of divalent metal ions on a chelating resin containing iminodiacetate groups
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DOI：
10.1021/ac00066a021
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发表时间：
1993-09
影响因子：
7.4
通讯作者：
M. Pesavento;R. Biesuz;M. Gallorini;A. Profumo
中科院分区：
文献类型：
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作者：
M. Pesavento;R. Biesuz;M. Gallorini;A. Profumo
金属离子在螯合树脂上的吸附被认为是通过活性基团的络合作用发生的。因此，预期树脂对不同金属的选择性与具有与活性基团的结构类似的结构的单体的络合性质相当。这种相关性可以在Gibbs-Donnan模型的基础上以定量的方式进行，该模型允许从络合常数和其他量（例如溶液中的反离子浓度）预测金属离子在螯合树脂上的萃取系数。在含有亚氨基二乙酸基团的螯合树脂的情况下，对某些二价金属离子的选择性比在水溶液中由亚氨基二乙酸络合所预期的差得多
The sorption of metal ions on chelating resins is believed to take place through complexation by the active groups. Thus the selectivity of the resin for different metals is expected to be comparable to the complexing properties of a monomer having a structure similar to that of the active groups. This correlation can be done in a quantitative way on the basis of the Gibbs-Donnan model, which allows prediction of the extraction coefficients of metal ions on a chelating resin from the complexation constants, and other quantities, such as the concentration of the counterion in solution. In the case of chelating resins containing iminodiacetic groups, the selectivity toward some divalent metal ions is much worse than expected from the complexation by iminodiacetate in aqueous solution