Preconcentration of Cr(VI) ion on melamine formaldehyde resin

Abstract

Trace amounts of Cr(VI) have been enriched from aqueous solutions by exchange of Cr(VI) on melamine-formaldehyde resin. The exchange capacity increased at lower pH-values. The material was used to preconcentrate Cr(VI) very efficiently from 0.1 μg ml−1 solutions of chromate. After the Cr(VI) adsorbed on the column is eluted, it is analysed by atomic absorption spectroscopy and almost 100% recovery was achieved in every instance. The effect of other anions was examined and it was observed that the adsorption of Cr(VI) was not significantly affected by the presence of other anions.