Abstract
Terpolymer resins, synthesized by the condensation of salicylic acid and melamine with formaldehyde in the presence of an acid catalyst, proved to be a selective chelating ion-exchange polymer for certain metals. The chelating ion-exchange properties of this polymer were studied for Cu 2+, Ni 2+, Co 2+, Zn 2+, Fe 3+, Cd 2+ and Pb 2+ ions. A batch equilibrium method was employed in the study of the selectivity of metal ion uptake involving the measurements of the distribution of a given metal ion between the polymer sample and a solution containing the metal ion. The study was carried out over a wide pH range and in media of various ionic strengths. The terpolymer showed a higher selectivity for Fe 3+, Cu 2+ and Ni 2+ ions than for Co 2+, Zn 2+, Cd 2+ and Pb 2+ ions.
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