SEPARATION OF PD(II) AND CU(II) IN CHLORIDE SOLUTIONS ON A GLYCOL METHACRYLATE GEL DERIVATIZED WITH 8-HYDROXYQUINOLINE

The adsorption of Pd(II) ions on Spheron Oxine 1000, a hydrophilic glycol methacrylate gel bearing 8-hydroxyquinoline groups, was investigated. The work was undertaken in flow conditions, using columns with different inner diameters packed with 1 g of the dry polymer. The adsorption and desorption isoplanes were determined under different hydrodynamic and chemical conditions. The breakthrough volume (95% removal efficiency) and the corresponding capacities were calculated from the isoplanes at different flow-rates and compared with hatch results. The dynamic capacity obtained under saturation conditions was 57 +/- 1 mg Pd(II)/g resin, at a flow-rate of 1.0 ml/min. High concentration and almost complete elution of Pd(II) were achieved using acidified thiourea solution, which also allowed the recycling of the chromatographic material. The separation of mixtures of Pd(II) and Cu(II) was achieved by appropriate adjustment of the pH of the feed solution to ensure selective sorption. Separation via appropriate acidic elution did not accomplish good selectivity.