Voltammetric determination of nitrofurantoin at a mercury meniscus modified silver solid amalgam electrode

Zuzana Krejčová, Jiří Barek, Vlastimil Vyskočil

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Electrochemical behavior of nitrofurantoin (NF) was studied by direct current voltammetry (DCV), differential pulse voltammetry (DPV), and cyclic voltammetry (CV) using a mercury meniscus modified silver solid amalgam electrode (m-AgSAE). Voltammetric behavior of NF was studied in cathodic region of potentials in dependence on pH. pH7.0 was selected as an optimal medium for the determination of NF by both DCV and DPV, with the optimal methanol-water volume ratio of 1:9. In order to reduce the negative influence of electrode passivation, the suitable regeneration potentials were found (0mV and -900mV). The optimal conditions were found for the determination of NF in concentration ranges from 6×10-6molL-1 to 1×10-4molL-1 using DCV technique, and from 2×10-7molL-1 to 1×10-4 molL-1 using DPV technique, both in the medium of methanol-Britton-Robinson buffer pH7.0 (1:9). The attained limit of quantification (LOQ) of NF was 1.6×10-6molL-1 for DCV and 8.1×10-8molL-1 for DPV. The practical applicability of the newly developed DPV method was verified by direct determination of NF in model samples of drinking and river water, with LOQs 2.2×10-7molL-1 and 2.5×10-7molL-1, respectively.

Original languageEnglish
Pages (from-to)185-192
Number of pages8
JournalElectroanalysis
Volume27
Issue number1
DOIs
Publication statusPublished - 1 Jan 2015
Externally publishedYes

Keywords

  • Drinking water
  • Mercury meniscus modified silver solid amalgam electrode
  • Nitrofurantoin
  • River water
  • Voltammetry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry

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