Ion-exchange resin abbreviated as HPEG-I was synthesized by polycondensation in the presence of polyphosphoric acid as a catalyst using monomers p-hydroxybenzaldehyde (0.1M), terephthalic acid (0.1M) and ethylene glycol (0.3M) at 1200C. The terpolymer resin was characterized by elemental analysis, the number average molecular weight, UV-Visible, IR and 1H NMR spectrum. Chelating ion-exchange properties of HPEG-I terpolymer was studied for Sb3+, Bi3+, Zn2+ and Mg2+ ions by the batch equilibrium method. The metal ions were estimated spectrophotometrically. The study was carried out over a wide pH range and in media of various ionic strengths. The terpolymer resin can be used as a selective ion exchange resin for Bi3+ , Mg2+ and Zn2+ ions.
