极性基团附着在聚合物基质上的发现使许多类型的合成离子交换材料能够用于水和废水处理，因为它们具有高选择性和特异性。所涉及的交换器包括铵、硼、铯、铜、汞和硝酸盐。讨论了大约20种可用的螯合树脂。包括42个参考文献、表格和图表。

The discovery that polar groups attach to polymeric matrices has enabled many types of synthetic ion-exchange materials to be used in water and wastewater treatments because of their high selectivity and specificity. Exchangers covered include ammonium, boron, cesium, copper, mercury, and nitrate. Approximately 20 available chelate resins are discussed. Includes 42 references, tables, figures.