Study of Electrochemical Oxidation and Quantification of the Pesticide Pirimicarb Using a Boron-Doped Diamond Electrode

Autor(es)

Guimaraes Selva, Thiago Matheus ; de Araujo, William Reis ; Bacil, Raphael Prata ; Longo Cesar Paixao, Thiago Regis

• Tipo de documento: Artigo Científico
• Fonte: Electrochimica Acta; v. 246, p. 588-596, AUG 20 2017.
• Citações Web of Science: 9

Resumo

An electrochemical study of the carbamate pesticide pirimicarb (PMC), which acts on the central nervous system, was performed using a boron-doped diamond working electrode. Cyclic, differential pulse, and square-wave voltammetry experiments across a wide pH range (2.0 to 8.0) showed three irreversible oxidation processes in the voltammetric behavior of PMC. The two first processes were pH-dependent, while the third was not. The three oxidation process were independent of each other, and each involved the transfer of one electron. A reaction proposal for the electrochemical oxidation of PMC is shown, and it is supported by mass spectrometry experiments. After this, an analytical method for PMC quantification in water samples by differential pulse (DP) voltammetry is proposed. The optimal DP voltammetric parameters (step potential, amplitude potential, and scan rate) were optimized using experimental design, and an analytical curve was obtained from 2.0 to 219 mu mol L (1) with an estimated detection limit of 1.24 mu mol L (1). The accuracy of the proposed method was evaluated by the addition and recovery method, with recoveries ranging from 88.6 to 96.3%. Some highlights of the proposed analytical method are its simplicity, reliability, and portability. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 16/16477-9 - Fabricação de dispositivos analíticos portáteis baseados em plataformas de papel com sistema de detecção eletroquímica e colorimétrica visando aplicações forenses, clínicas e ambientais
• Beneficiário: William Reis de Araujo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/06642-1 - Formação e propriedades de adutos de hidróxi-compostos orgânicos com carbonato em meio aquoso e condições biológicas
• Beneficiário: Claudimir Lucio Do Lago
• Modalidade de apoio: Auxílio à Pesquisa - Regular