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Ion Exchange Behavior of Selected Elements on Chelex 100 Resin

Abstract Ion exchange behavior of some selected elements on Chelex 100 ion exchange resin in weakly acidic medium has been investigated. The acidity and the concentration of the supporting electrolyte have considerable influence on the sorption of metal cations by the ion exchanger. Column experiments have revealed that elution of cobalt and zinc in the definite pH range exhibits certain deviation compared to the other examined elements, resulting in doubly peaked elution curve. Apart from the commonly known cation (chelating) exchange function, under appropriate conditions Chelex 100 can also act as an anion exchanger. Ion exchange behavior of mercury in diluted hydrochloric acid medium is an illustration of amphoteric character of this resin. Two regions of pH can be distinguished, which correspond to the specified sorption mechanism of the metal by Chelex 100. In practical aspect, the use of Chelex 100 for the separation of trace amounts of several selected elements is demonstrated.