Voltammetric concentration measurements in diffusion-hindered media

László Kiss, Zsuzsanna Ori, Lívia Nagy, Barna Kovács, Géza Nagy

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

In voltammetric analysis the signal-in most cases-depends on transport processes. When getting concentration values of analytes from voltammetric calibrating curves, it is expected that the mass transport characteristics in sample solutions and in calibrating standards are identical. Standard additionmethods are used in analytical practice when making calibrating standard with transport propertiesmatching that of the samples would be difficult. Voltammetric measurements can also be carried out in soil-in sediment-or in gel samples. The mass transport conditions in these media, however, can considerably differ from those existing in aqueous solutions. The application of standard addition technique, however, is not an option there. In this work, a glassy carbon electrode was applied with a built-in diffusion layer on its measuring surface and chronoamperometric measurements were carried out. The current-time transients taken in aqueous solution and in tortuous, diffusion-hindered media were compared. Ascorbic acid and iodine as analytes as well as silica sand sediments and green pepper pulps as tortuous matrices were used. It was proved that if the modified electrode is used for analysis, then short time chronoamperometric transients taken in tortuous media can be evaluated by calibration data taken in aqueous standard solutions.

Original languageEnglish
Pages (from-to)3039-3045
Number of pages7
JournalJournal of Solid State Electrochemistry
Volume17
Issue number12
DOIs
Publication statusPublished - Dec 1 2013

Keywords

  • Ascorbic acid
  • Chronoamperometry
  • Diffusion layer modified electrode
  • Hindered diffusion
  • Silica sand sediment
  • Tortuosity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

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