Anodic Adsorptive Stripping Voltammetric Determination of Atrazine in Spiked Soil Samples with a Gold Microelectrode

Abstract

Microwave‐assisted solvent extraction was combined with anodic adsorptive stripping voltammetry at a gold microelectrode to extract and quantify the herbicide atrazine in spiked soil samples. A systematic study of the experimental parameters affecting the stripping response was carried out by square‐wave voltammetry. The voltammetric procedure is based on controlled adsorptive accumulation of atrazine at the potential of 0.35 V (versus Ag/AgCl) in the presence of Britton–Robinson buffer pH (2.0). The limit of detection obtained for a 30 sec collection time was 4.3 × 10⁻⁷ mol L⁻¹. Recovery experiments, at the 1 µg g⁻¹ level of spiking, gave good results for the global procedure, and the values found were comparable to those obtained by HPLC.

Keywords:

• Atrazine
• Gold microelectrode
• Anodic adsorptive stripping voltammetry
• Spiked soil samples

Acknowledgments

The authors thank the Fundação para a Ciência e a Tecnologia for the financial support through the project POCTI/AGR/44491/2002 (cofinanced by FEDER).