Voltammetric analysis of mancozeb and its degradation product ethylenethiourea

• Type: Article in International Scientific Journal
• Date: 2015

Authors

López Fernández, O (Author) Other; Barroso, MF (Author) Other; Diana M Fernandes (Author) FCUP; Rial Otero, R (Author) Other; Simal Gándara, J (Author) Other; Morais, S (Author) Other; Nouws, HPA (Author) Other; Cristina Freire (Author) FCUP; Delerue Matos, C (Author) Other

Journal

Title: Journal Of Electroanalytical Chemistry

Vol. 758

Pages: 54-58

ISSN: 1572-6657

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 3 Citations

Other information

Authenticus ID: P-00G-SDH

DOI: 10.1016/j.jelechem.2015.08.030

Abstract (EN): The purpose of this work was to develop a reliable alternative method for the determination of the dithiocarbamate pesticide mancozeb (MCZ) in formulations. Furthermore, a method for the analysis of MCZ's major degradation product, ethylenethiourea (ETU), was also proposed. Cyclic voltammetry was used to characterize the electrochemical behavior of MCZ and ETU, and square-wave adsorptive stripping voltammetry (SWAdSV) was employed for MCZ quantification in commercial formulations. It was found that both MCZ and ETU are irreversibly reduced (- 0.6 V and - 0.5 V vs Ag/AgCl, respectively) at the surface of a glassy carbon electrode in a mainly diffusion-controlled process, presenting maximum peak current intensities at pH 7.0 (in phosphate buffered saline electrolyte). Several parameters of the SWAdSV technique were optimized and linear relationships between concentration and peak current intensity were established between 10-90 ¿mol L- 1 and 10-110 ¿mol L- 1 for MCZ and ETU, respectively. The limits of detection were 7.0 ¿mol L- 1 for MCZ and 7.8 ¿mol L- 1 for ETU. The optimized method for MCZ was successfully applied to the quantification of this pesticide in two commercial formulations. The developed procedures provided accurate and precise results and could be interesting alternatives to the established methods for quality control of the studied products, as well as for analysis of MCZ and ETU in environmental samples.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5