Preconcentration and separation of palladium(II) and platinum(IV) on a dithizone anchored poly(vinylpyridine)-based chelating resin

A chelating resin was prepared through the reaction between chloromethylated poly(vinylpyridine) and dithizone. The resin shows high affinity for noble metal ions such as palladium(II), platinum(IV) and gold(III). At batch and column levels, the preconcentration of palladium and platinum was studied. Various conditions such as pH, temperature, flow rate and column parameters were optimized for the maximum extent of palladium and platinum loading. Palladium and platinum loadings of 100 and 250 mg g−1, respectively, were achieved at optimized conditions. Mixtures of 0.1 M HCl and 1.0% thiourea or 0.1 M HCl and 5.0% thiourea solution could elute palladium and platinum quantitatively. Separation of palladium(II) and platinum(IV) from gold(III) and nickel(II) was achieved quantitatively.