The uptake of heavy metal ions by ion-exchange resins is rather affected by certain variables such as pH, temperature, initial metal concentration and contact time. Ionic charge also plays an important role in ion-exchange process. The influence of ionic charge on the removal of Ce4+, Fe3+ and Pb2+ from aqueous systems by cation-exchange resin purolite C100 was tested by Abo-Farha et al. They found that the metal ions adsorption sequence can be given as Ce4+ > Fe3+ > Pb2+. Similar results for Co2+, Ni2+ and Cr3+ on an Amberlite IRN-77 cationexchange resin were previously obtained by Kang et al.