Electrochemical Detection of Selenium (IV) and (VI) at Gold-Modified Diamond Electrodes

Tribidasari A. Ivandini, Yasuaki Einaga

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Electrochemical detection of Se (IV) and (VI) was investigated at gold-modified boron-doped diamond electrodes. Cyclic voltammetry in acid condition showed that the onset of current flows of Se (IV) and Se (VI) occurred at almost similar potentials. Furthermore, the currents at the peak potential of ∼0.9 V (vs. Ag/AgCl) showed high linearity against concentrations of both Se (IV) and Se (VI) with estimated limits of detection (S/N = 3) of 20 and 50 ppb, respectively. However, whereas oxidation peaks of Se (IV) and Se (VI) can be observed in acid and neutral pH, only oxidation peak of Se (IV) appeared in high pH. The possibility to differentiate a mixture of Se (IV) and Se (VI) by applying cyclic voltammogram (CV) at acidic and basic conditions was discussed, and it was promising, especially because, previously, it always stated that Se (VI) was not electrochemically active.

Original languageEnglish
Pages (from-to)367-374
Number of pages8
JournalElectrocatalysis
Volume4
Issue number4
DOIs
Publication statusPublished - 2013

Fingerprint

Diamond
Selenium
Gold
Diamonds
Oxidation
Electrodes
Acids
Boron
Cyclic voltammetry

Keywords

  • Cyclic voltammetry
  • Gold-modified boron-doped diamond electrodes
  • Selenium (IV) and (VI)
  • Speciation

ASJC Scopus subject areas

  • Electrochemistry

Cite this

Electrochemical Detection of Selenium (IV) and (VI) at Gold-Modified Diamond Electrodes. / Ivandini, Tribidasari A.; Einaga, Yasuaki.

In: Electrocatalysis, Vol. 4, No. 4, 2013, p. 367-374.

Research output: Contribution to journalArticle

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AB - Electrochemical detection of Se (IV) and (VI) was investigated at gold-modified boron-doped diamond electrodes. Cyclic voltammetry in acid condition showed that the onset of current flows of Se (IV) and Se (VI) occurred at almost similar potentials. Furthermore, the currents at the peak potential of ∼0.9 V (vs. Ag/AgCl) showed high linearity against concentrations of both Se (IV) and Se (VI) with estimated limits of detection (S/N = 3) of 20 and 50 ppb, respectively. However, whereas oxidation peaks of Se (IV) and Se (VI) can be observed in acid and neutral pH, only oxidation peak of Se (IV) appeared in high pH. The possibility to differentiate a mixture of Se (IV) and Se (VI) by applying cyclic voltammogram (CV) at acidic and basic conditions was discussed, and it was promising, especially because, previously, it always stated that Se (VI) was not electrochemically active.

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