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Updated: Aug 18, 2026

An Anaerobic Biosensor Assay for the Detection of Mercury and Cadmium
Published on: December 17, 2018
Simultaneous determination of cadmium and lead in medicinal plants by anodic stripping voltammetry
Mónica Cecilia Vargas Mamani1, Luiz Manoel Aleixo, Mônica Ferreira de Abreu
1Institute of Chemistry, Department of Analytical Chemistry, State University of Campinas, P.O. Box 6154, 13084-971 Campinas, São Paulo, Brazil.
Abstract:
A simple method for the simultaneous determination of Cd and Pb in medicinal plants by differential pulse anodic stripping voltammetry, using a hanging mercury drop electrode, was developed. The pre-concentration of the metals was performed in 0.8 mol L(-1) HCl at -0.73V for 180s. The sample preparation was carried out by dry-ashing 1.0g of finely pulverized plant samples for 2.5h at 500 degrees C. The determination limit of the method was 0.12 and 0.010 mg kg(-1) for Pb and Cd, respectively. The method was applied to the quantification of cadmium and lead in samples of Hypericum perforatum, Mikania guaco, Mikania glomerata and Peamus boldus. The voltammetric method was shown to be useful for the control of contaminants in medicinal plants.
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