Synthesis and Application of Amberlite XAD-2 Functionalized with Dithizone for Field Preconcentration and Separation of Trace Cadmium in Seawater

Abstract

A chelating resin coupling Amberlite XAD-2 functionalized with dithizone is synthesized and characterized. Dissolved cadmium is field-preconcentrated using a minicolumn packed with the synthesized resin and determined by flame atomic absorption spectrometry. Five experimental variables are evaluated. The enrichment factor of 416 is obtained for 50 mL of sampling volume, and the detection limit (3 σ) of the procedure is 6.7 ng L^-1. The precision (RSD) for 11 independent determinations is 1.97%. This method has been successfully applied to the determination of cadmium in natural seawater samples.