For this purpose,25–1000 mL volumes of the model solutions containing 5 lg L1 of Cd(II) and 10 lg L1 of Pb(II) were passed through column under the optimum conditions (pH 3.5, eluent: 25 mL of
3 mol L1 HNO3, sample and eluent flow rates: 2 mL min1 , resin
amount: 1 g).