A novel paste electrode based on a silver solid amalgam and an organic pasting liquid

Ales Danhel, Bogdan Yosypchuk, Vlastimil Vyskocil, Jiri Zima, Jiri Barek

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The silver solid amalgam fine powder mixed with a proper pasting liquid, firstly introduced in this work, was found to be a new suitable electrode material for sensitive voltammetric determination of electrochemically reducible organic compounds. The optimal composition of the amalgam (mercury/silver ratio) and the formed paste (i.e., quality and quantity of pasting liquid and its ratio relative to amalgam) was tested by modern voltammetric methods using 4-nitrophenol as a model compound. This new non-toxic electrode material combines the advantages of an easily renewable paste electrode surface solving the problems connected with the passivation of the solid electrodes and of amalgam electrodes providing good mechanical stability, simple handling and preparation, wide potential window in cathodic potential range and sufficient sensitivity. The silver amalgam fine powder prepared in the weight ratio 60/40 (Hg/Ag) mixed with paraffin oil in the weight ratio 20:1 (w/w) was found to be the most convenient for the determination of 4-nitrophenol using differential pulse voltammetry with limit of detection 1 μmol l-1 in 0.2 mol l-1 acetate buffer pH 4.8.

Original languageEnglish
Pages (from-to)218-222
Number of pages5
JournalJournal of Electroanalytical Chemistry
Volume656
Issue number1-2
DOIs
Publication statusPublished - 15 Jun 2011
Externally publishedYes

Keywords

  • 4-Nitrophenol
  • Paste electrode
  • Silver amalgam
  • Voltammetry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemical Engineering(all)
  • Electrochemistry

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