Two methods for preconcentration of heavy metals from seawater: APDC/Freon extraction and CHELEX-100 ion exchange chromatography, have been compared. Retention of heavy metals on a CHELEX-100 resin in the acid form was not complete. Consistent and reliable results were obtained for Ni. Cd, Pb, and Zn by both studied preconcentration methods. CHELEX-100 ion exchange chromatography is not suitable for Fe and Cu preconcentration because of the low recoveries obtained, 79 and 72 respectively. Applying the CHELEX-100 ion exchange chromatography method, the preconcentration factor and the consuming time were higher than when the APDC/Freon extraction method was used.
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