Abstract
change have been published in recent years. Beauvais and Alexandratos gave an overview of polymer-supported reagents for the selective complexation of metal ions.3 Abrams and Millar published a history of the origin and development of macroporous ion-exchange resins.4 The literature indicates an increasing interest in the use of ion-exchange processes for applications in the environmental fields. The recently published Environmental Ion Exchange: Principles and Design gives a comprehensive overview of ion exchange’s application to treating water/wastewater.5 Also, a number of recent U.S. patents involve ion-exchange resins in the areas of waste treatment and minimization. Two patents were issued for the removal of heavy metal cations from organic solutions, while another was issued for the removal of anions from organic solutions.6 One utilizes a chelating resin for removal,7 while the other uses a mixture of a chelating resin and an anion-exchange resin.8 Two
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