Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/7245
Título: Voltammetric analysis of mancozeb and its degradation product ethylenethiourea
Autor: López-Fernández, Olalla
Barroso, M. Fátima
Fernandes, Diana M.
Rial-Otero, Raquel
Simal-Gándara, Jesús
Morais, Simone
Nouws, Henri P.A.
Freire, Cristina
Delerue-Matos, Cristina
Palavras-chave: Mancozeb
Ethylenethiourea
Cyclic voltammetry
Square-wave adsorptive stripping voltammetry
Data: Dez-2015
Editora: Elsevier
Relatório da Série N.º: Journal of Electroanalytical Chemistry;Vol. 758
Resumo: 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 μmol L− 1 and 10–110 μmol L− 1 for MCZ and ETU, respectively. The limits of detection were 7.0 μmol L− 1 for MCZ and 7.8 μmol 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.
URI: http://hdl.handle.net/10400.22/7245
DOI: 10.1016/j.jelechem.2015.08.030
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S1572665715300862
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