Voltammetric analysis of mancozeb and its degradation product ethylenethiourea

• Tipo: Artigo em Revista Científica Internacional
• Data: 2015

Autores

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

Revista

Título: Journal Of Electroanalytical Chemistry

Vol. 758

Páginas: 54-58

ISSN: 1572-6657

Editora: Elsevier

Indexação

ISI Web of Knowledge - 1 Citação

Scopus - 3 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 5