Collect. Czech. Chem. Commun. 2004, 69, 1590-1599

Square Wave Voltammetric Determination of Trace Amounts of Europium(III) at Montmorillonite-Modified Carbon Paste Electrodes

Xiaobo Ji and Shengshui hu*

Department of Chemistry, Wuhan University, Wuhan 430072, China


A carbon paste electrode modified with montmorillonite for the determination of Eu(III) was developed. This chemically modified electrode exhibits strong and stable electroactivity for Eu(III). Square wave voltammetry (SWV) of Eu(III) was evaluated with respect to the quantity of modifier, pH of electrolyte solution, accumulation potential and time. The stripping peak currents increase linearly with concentrations of Eu(III) from 1.0 × 10-7 to 2.0 × 10-5 mol l-1. The detection limit is estimated to be 4 × 10-8 mol l-1 (S/N = 3). The recommended method has been applied to the quantitation of Eu(III) in stream sediment samples; the results obtained by the SWV approach are in good agreement with reference values.

Keywords: Europium(III); Square wave voltammetry; Montmorillonite; Chemically modified electrodes; Electrochemistry.

References: 23 live references.