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 gly col methacrylate gel bearing 8-hydroxyquinoline groups, was investigat ed. The work was undertaken in flow conditions, using columns with dif ferent inner diameters packed with 1 g of the dry polymer. The adsorpt ion and desorption isoplanes were determined under different hydrodyna mic and chemical conditions. The breakthrough volume (95% removal effi ciency) and the corresponding capacities were calculated from the isop lanes at different flow-rates and compared with hatch results. The dyn amic 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 almo st complete elution of Pd(II) were achieved using acidified thiourea s olution, which also allowed the recycling of the chromatographic mater ial. The separation of mixtures of Pd(II) and Cu(II) was achieved by a ppropriate adjustment of the pH of the feed solution to ensure selecti ve sorption. Separation via appropriate acidic elution did not accompl ish good selectivity.