627th International Conference on Chemical and Environmental Science, Habana, Cuba, 20 - 24 July 2019, pp.1-5
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).