627th International Conference on Chemical and Environmental Science, Habana, Küba, 20 - 24 Temmuz 2019, ss.1-5
In the present paper, selective sorption of lead and cadmium ions on modified XAD-4 resin was investigated. For chemical modification of Amberlite XAD-4 resin, m-phenylendiamine was used. This modified chelating resin was used for preconcentration of Pb(II) and Cd(II).The procedure is based on the adsorption of Pb(II) and Cd(II) ions on a column of modified Amberlite XAD-4 resin loaded components prior to their determination by atomic absorption spectrophotometry. The effects of pH, amount of solid phase, eluent type and volume of the sample solution, flow rate of solution on the retention of the metal ions have been studied. The optimum pH value of quantitative sorption for Pb(II) and Cd(II) was found to be 5. These metal ions can be desorbed with 1 M HCl (recovery 95-100 %). The effects of some interfering ions were also studied. The optimum experimental parameters were determined to be pH 5, concentration of 10 mg/L, contact time of 30 min and 0.2 g of adsorbent for a quantitative adsorption of the metals. The optimum flow rate was found as 2.5 mL/min for all metal ions. Each column can be used up to 10 successive analyses without considerable change in recoveries of metal ions. The results indicate advantages of high metal adsorption capacity and satisfactory recovery of Pb(II) and Cd(II).