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Use of EDTA-Grafted Anion-Exchange Resin for the Separation of Selective Heavy Metal Ions

Abstract: The use of EDTA-grafted anion exchange resin Amberlite IRA-420 in Cl- form was investigated for the selective elution of cations in tertiary butyl alcohol admixture with formic acid and compared the separation efficacy with respect to the pristine Amberlite IRA-420 resin. EDTA is a hexa-dentate chelate forming agent and with the incorporation of EDTA, the distribution coefficients of metal ions were increased significantly. Based on the distribution co-efficient data, mixtures of metal ions viz. Cu-Pd-Cd on pristine resin and Fe-Cu-Zn on modified resin were easily and successfully separated. There was no tailing observed in separating the ions on modified resin while it was seen on the pristine resin. The average recovery for all separations were within 83.7-98.2 % and the standard deviation for data (6 results) was ± 0.9629. Effectiveness of the resin was justified by selectively eluting metal ions from river water and the amount of metal ions were quantified in microgram range using AAS technique.