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

11 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

Fingerprint

Environmental Pollutants
contaminants
Electrodes
electrodes
Oxygen
regeneration
Electrolytes
Methanol
Buffers
oxygen
methyl alcohol
buffers
sodium sulfites
electrolytes
mercury amalgams
Mercury amalgams
drinking
Mercury (metal)
menisci
Reducing Agents

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

Cite this

A miniaturized electrode system for voltammetric determination of electrochemically reducible environmental pollutants. / Hájková, Andrea; Vyskočil, Vlastimil; Josypčuk, Bohdan; Barek, Jiří.

In: Sensors and Actuators, B: Chemical, Vol. 227, 01.05.2016, p. 263-270.

Research output: Contribution to journalArticle

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