Electrochemical behaviour of persulphate on carbon paste electrodes modified with Prussian blue and analogous compounds

M. Weißenbacher, K. Kalcher*, H. Greschonig, W. Ng, Wing Hong CHAN, A. Voulgaropoulos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Peroxodisulphate ("persulphate") may be determined by direct current voltammetry (DCV) using carbon paste electrodes chemically modified with Prussian Blue, iron(III)-hexacyanoruthenate(II) or iron(III)-hexacyano-osmate(II). The determination is based on the exploitation of catalytic currents from the reduction of the modifiers. Best results are obtained for iron(III)-hexacyanoosmate(II) yielding a detection limit of 1 μg O22-/ml (as persulphate) when using HCl (10-2 mol/l) as supporting electrolyte and measuring in the DCV-mode. Electrodes doubly-modified with the osmium compound and a liquid anion-exchanger (Amberlite LA2) allow determinations of persulphate after preconcentration under open circuit conditions, in the presence of hydrogen peroxide and perborate, with a detection limit of 20 ng O22-/ml (as persulphate).

Original languageEnglish
Pages (from-to)87-92
Number of pages6
JournalAnalytical and Bioanalytical Chemistry
Volume344
Issue number3
DOIs
Publication statusPublished - Mar 1992

Scopus Subject Areas

  • Biochemistry

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