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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The use of modified electrode with carbon black as sensor to the electrochemical studies and voltammetric determination of pesticide mesotrione

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Author(s):
Deroco, Patricia Batista ; Lourencao, Bruna Claudia ; Fatibello-Filho, Orlando
Total Authors: 3
Document type: Journal article
Source: Microchemical Journal; v. 133, p. 188-194, JUL 2017.
Web of Science Citations: 17
Abstract

A new, simple, sensitive and fast analytical method has been developed for the quantification of the pesticide mesotrione (MST) using square-wave voltammetry (SWV) and a modified glassy carbon electrode with carbon black (CB/GCE) in the presence of the cationic surfactant cetyltrimethylammonium bromide (CTAB). MST exhibited three well-defined irreversible reduction peaks, at -242, -710 and -1105 mV (vs. Ag/AgCl (3.0 mol L-1 KCl)), by cyclic voltammetry in phosphate buffer solution (pH 2.0) containing 30.0 mu mol L-1 CTAB. An electrocatalytic effect was observed for the first peak; the apparent heterogeneous electron-transfer rate constant (k) obtained using electrochemical impedance spectroscopy for a 5.0 mmol L-1 K-3{[}Fe(CN)(6)]/5.0 mmo lL(-1) K4IFe(CN)(6)] (1:1) solution was 9.77 x 10(-3) cm s(-1), almost two orders of magnitude greater than the rate constant obtained for the GCE electrode (2.15 x 10(-4) cm s(-1)). The analytical curve for MST was linear in the MST concentration range from 0.040 to 7 2 {[}mu mol L-1 with a limit of detection of 0.026 mu mol L-1. This method was used to determine MST concentration in natural lake and tap water samples and in a sugarcane juice sample, with satisfactory results. (C) 2017 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 14/03019-7 - Evaluation and analytical application of boron doped diamond porous electrodes for voltammetric determination of biomolecules, ascorbic acid, uric acid, dopamine and adrenaline in biological fluids and/or pharmaceutical formulations
Grantee:Bruna Cláudia Lourenção
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 14/07919-2 - Preparation of electrodes with new carbon-based materials for applications in electroanalytical
Grantee:Patrícia Batista Deroco
Support type: Scholarships in Brazil - Doctorate