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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.)

Simultaneous electroanalytical determination of hydroquinone and catechol in the presence of resorcinol at an SiO2/C electrode spin-coated with a thin film of Nb2O5

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Author(s):
Canevari, Thiago C. [1] ; Arenas, Leliz T. [2] ; Landers, Richard [3] ; Custodio, Rogerio [1] ; Gushikem, Yoshitaka [1]
Total Authors: 5
Affiliation:
[1] Univ Estadual Campinas, Inst Chem, BR-13084971 Campinas, SP - Brazil
[2] Univ Fed Rio Grande do Sul, Inst Chem, Porto Alegre, RS - Brazil
[3] Univ Estadual Campinas, Inst Phys Gleb Wataghin, BR-13084971 Campinas, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ANALYST; v. 138, n. 1, p. 315-324, 2013.
Web of Science Citations: 41
Abstract

This paper describes the development, characterization and application of an Nb2O5 film formed on the surface of a carbon ceramic material, SiO2/C, obtained by a sol-gel method, using the spin-coating technique. The working electrode using this material will be designated as SiCNb. Hydroquinone and catechol can be oxidized at this electrode in the presence of resorcinol, allowing their simultaneous detection. The electrochemical properties of the resulting electrode were investigated using cyclic and differential pulse voltammetry techniques. Well-defined and separated oxidation peaks were observed by differential pulse voltammetry in Tris-HCl buffer solution at pH 7 containing 1 mol L-1 KCl in the supporting electrolyte solution. The SiCNb electrode exhibited high sensitivity in the simultaneous determination of hydroquinone and catechol in the presence of resorcinol, with the limits of detection for hydroquinone and catechol being 1.6 mu mol L-1 and 0.8 mu mol L-1, respectively. Theoretical calculations were performed to determine the ionization energies of hydroquinone, catechol and resorcinol; the results were used to explain the simultaneous determination of species by differential pulse voltammetry. The presence of resorcinol did not produce any interference in the simultaneous detection of hydroquinone and catechol on the surface of the modified electrode. (AU)

FAPESP's process: 00/11103-5 - Porous materials: preparation, properties and applications
Grantee:Yoshitaka Gushikem
Support Opportunities: Research Projects - Thematic Grants