Fast and simple differential pulse adsorptive stripping voltammetric determination of Ce(III) in natural water samples

This work concerns straightforward, cost-effective, and time-saving adsorptive stripping voltammetric (AdSV) procedure for trace quantification of cerium(III) in natural water samples rich in an organic matrix. The method is based on adsorptive accumulation of the Ce(III)-Alizarin S complex at a glassy carbon electrode (GCE) surface. The experimental parameters (pH and concentration of supporting electrolyte, complexing agent concentration, potential and time of accumulation) and the impact of possible disturbances were studied. It has been proven that interferences caused by organic matrix such as surface-active and humic substances could be removed by the addition of Amberlite XAD-7 resin to the analyzed sample prior to the appropriate voltammetric measurement. Under optimized circumstances, a linear purview of 0.2-8 mu mol L-1 and a limit of detection value of 0.06 mu mol L-1 were gained. The featured AdSV procedure was utilized to determine cerium in enriched water samples from the Bystrzyca River and Lake Zemborzyce, which corroborates analytical application.