Voltammetric determination of selected nitro compounds at a polished silver solid amalgam composite electrode

Vlastimil Vyskočil, Tomáš Navrátil, Aleš Daňhel, Jan Dědík, Zuzana Krejčová, Lucie Škvorová, Jana Tvrdíková, Jiří Barek

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57 Citations (Scopus)

Abstract

Voltammetric behavior of selected biologically active organic nitro compounds, namely 2-nitrofluorene, picric acid (2,4,6-trinitrophenol) and metronidazole, has been investigated using direct current voltammetry (DCV) and differential pulse voltammetry (DPV) at a polished silver solid amalgam composite electrode (p-AgSA-CE). The optimum conditions have been found for their determination in a 1 : 1 mixture of methanol and aqueous Britton-Robinson buffer of pH 5.0 for 2-nitrofluorene and in the aqueous Britton-Robinson buffer solutions of pH 2.0 and 4.0 for picric acid and metronidazole, respectively, with the limits of quantification (LQs) 4, 0.1 and 2 μmol L-1 (DCV at p-AgSA-CE) and 3, 1 and 4 μmol L-1 (DPV at p-AgSA-CE) for 2-nitrofluorene, picric acid and metronidazole, respectively. An attempt to increase the sensitivity using adsorptive stripping voltammetry was not successful for all three test substances. For comparison, the UV-vis spectrophotometric determinations of studied compounds have also been carried out in methanol for 2-nitrofluorene (LQ≈1 μmol L-1) and in deionized water for picric acid (LQ≈3 μmol L-1) and metronidazole (LQ≈2 μmol L-1). Practical applicability of the newly developed voltammetric methods was verified on direct determination of the studied compounds in drinking and river waters with LQs around 10-6 mol L-1 for all the studied compounds.

Original languageEnglish
Pages (from-to)129-139
Number of pages11
JournalElectroanalysis
Volume23
Issue number1
DOIs
Publication statusPublished - 1 Jan 2011
Externally publishedYes

Keywords

  • 2-Nitrofluorene
  • Drinking water
  • Metronidazole
  • Nitro compounds
  • Picric acid
  • River water
  • Silver solid amalgam composite electrode
  • Voltammetry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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  • Cite this

    Vyskočil, V., Navrátil, T., Daňhel, A., Dědík, J., Krejčová, Z., Škvorová, L., Tvrdíková, J., & Barek, J. (2011). Voltammetric determination of selected nitro compounds at a polished silver solid amalgam composite electrode. Electroanalysis, 23(1), 129-139. https://doi.org/10.1002/elan.201000428