A miniaturized electrode system for voltammetric determination of electrochemically reducible environmental pollutants

Andrea Hájková, Vlastimil Vyskočil, Bohdan Josypčuk, Jiří Barek

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

A newly designed miniaturized electrode system (MES) based on a mercury meniscus modified silver solid amalgam electrode as the working electrode was developed for voltammetric determination of electrochemically reducible organic compounds in small sample volumes. Genotoxic 2-aminofluoren-9-one (2-AFN) was chosen as a model environmental pollutant in this study to test the performance of the introduced MES. The determination of 2-AFN was carried out by differential pulse voltammetry in 100 μL samples under following conditions, using two different ways of air oxygen removal: (i) a supporting electrolyte methanol-Britton-Robinson (BR) buffer of pH 4.0 (1:9, v/v), with regeneration potentials Ereg,1 = 0 mV and Ereg,2 = -1200 mV and with oxygen removal by bubbling with nitrogen, and (ii) a supporting electrolyte methanol-BR buffer of pH 10.0 (1:9, v/v), with regeneration potentials Ereg,1 = -200 mV and Ereg,2 = -1600 mV and with oxygen removal by the addition of solid sodium sulfite as a reducing agent. The calibration curves were measured in the concentration range from 1 to 100 μmol L-1 of 2-AFN, with the limits of quantification about 1 μmol L-1 reached in both media. The practical applicability of the newly developed voltammetric methods using the MES was successfully verified on the direct determination of 2-AFN in model samples of drinking and river water.

Original languageEnglish
Pages (from-to)263-270
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume227
DOIs
Publication statusPublished - 1 May 2016
Externally publishedYes

Keywords

  • 2-Aminofluoren-9-one
  • Drinking and river water model samples
  • Miniaturized electrode system
  • Silver solid amalgam electrode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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