Preconcentration and separation of trace Pd(II) and Pt(IV) with silica gelbonded by aminopropyl-benzoylazo-4-(2-pyridylazo)-resorcinol

This paper reports a simple and highly selective method for preconcentratin g and separating of trace Pd(II) and Pt(IV) with silica gel bonded by amino propyl-benzoylazo-4-(2-pyridy-lazo)-resorcinol (ABPR.SG). ABPR.SG is stable in solution from 6 mol/L HCl to pH 7.0 and in common organic solvents. The maximum adsorptive capacity of Pd(II) on ABPR.SG is 362 mu mol/g. After pr econcentration and separation by using ABPR.SG column, Pd(II) and Pt(IV) of mu g/L level in artificial water samples can be measured reliably by commo n spectrophotometry. The maximum concentration factors of Pd(II) and Pt(IV) on ABPR.SG column are 143 and 125 respectively. The chromatographic column packed with ABPR.SG can be reused. The method is simple and efficient.