Terpolymers prepared by condensation of salicylic acid and thiourea with trioxane in presence of acid catalysts, proved to be selective chelating ion‐exchange resins for certain metals. Chelation ion‐exchange properties of these terpolymers were studied for Cu2+, Ni2+, Fe3+, Mn2+, Co2+, Zn2+, and UO22+ ions. A batch equilibration method was employed in the study of the selectivity of metal ion uptake involving the measurement of 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 terpolymers showed a higher selectivity for Cu2+, Fe3+, and UO22+ ions than for Mn2+, Co2+, and Zn2+ ions.
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Manavalan et al. (1983) studied this question.
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