Bismuth film electrode for the cathodic electrochemical determination of thiamethoxam

Valéria Guzsvány, Mihály Kádár, Ferenc Gaál, Luka Bjelica, K. Tóth

Research output: Contribution to journalArticle

57 Citations (Scopus)

Abstract

A cathodic electrochemical application of bismuth film modified glassy carbon electrode was investigated with the objective of determining thiamethoxam insecticide. The conditions of bismuth film deposition (electrode pretreatment procedure, composition of the plating solution, plating potential and film stability) were optimized using electrochemical and microscopic techniques. It was found that the bismuth film generation on glassy carbon substrate in a plating solution of 0.02 M Bi(NO3)3, 1 M HCl and 0.5 M KBr, at -0.25 V (vs. Ag/AgCl/3 M KCl) for 60 s and subsequent electrochemical conditioning yielded a modified electrode suitable for analytical purposes. Thiamethoxam was determined by differential pulse voltammetry in Britton - Robinson buffer of pH 8.0 in the concentration range of 1.26-45.0 μg/cm 3. The reproducibility of the analytical signal was characterized by a relative standard deviation smaller than 1.5%, and the calculated values of detection and quantitation limits were 0.38 μg/cm3 and 1.26 μg/cm3, respectively. The applicability of the modified electrode was tested on real, agriculturally-incurred potato and maize samples.

Original languageEnglish
Pages (from-to)1363-1371
Number of pages9
JournalElectroanalysis
Volume18
Issue number13-14
DOIs
Publication statusPublished - Jul 2006

Fingerprint

Bismuth
Plating
Electrodes
Glassy carbon
Insecticides
Voltammetry
Buffers
thiamethoxam
Substrates
Chemical analysis

Keywords

  • Bismuth and mercury film electrodes
  • Cathodic voltammetry
  • Scanning electron microscopy
  • Thiamethoxam insecticide

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Bismuth film electrode for the cathodic electrochemical determination of thiamethoxam. / Guzsvány, Valéria; Kádár, Mihály; Gaál, Ferenc; Bjelica, Luka; Tóth, K.

In: Electroanalysis, Vol. 18, No. 13-14, 07.2006, p. 1363-1371.

Research output: Contribution to journalArticle

Guzsvány, Valéria ; Kádár, Mihály ; Gaál, Ferenc ; Bjelica, Luka ; Tóth, K. / Bismuth film electrode for the cathodic electrochemical determination of thiamethoxam. In: Electroanalysis. 2006 ; Vol. 18, No. 13-14. pp. 1363-1371.
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