从高背景的常规阳离子中有选择性地去除痕量重金属离子

Select Removal of Trace Metal Ions from High Level Background of Conventional Cations

针对国内各类饮用水体中痕量重金属离子存在于常量的碱金属、碱土金属离子高背景下的污染特点，提出不同于常规离子交换法的用弱碱性阴离子交换树脂去除水中重金属阳离子的表面络合理论，认为重金属离子可以与树脂中的胺基官能团上的氮原子发生表面络合反应，从而达到选择性去除的目的。该工艺具有选择性强，经济方便的优点。

It is specific in the pollution with high background level of metal ions that the trace heavy metal ions are always appear in drinking water with normal alkali metal ions of hign level background.A process differ to conventional ion exchange process to remove the cations in water by weak base anion exchange resin has proposed on the basis of surface complextion.The authors think that the heavy metal ions shall be removed selectively by their surface complex reaction with the nitrogen atom in the amido function groups of the resin.This process in high selective,economical and easy to operate.