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Issue 3, 2007
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The voltammetric determination of peroxynitrite at a mercury film electrode

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Abstract

This report describes the direct voltammetric detection of peroxynitrite (PN, ONOO), an important analyte in many physiological biochemical pathways, at a mercury film electrode (MFE) at alkaline pH. The voltammetric response of PN is observed as a cathodic inverted peak when the potential is swept in the oxidative direction at ca. −0.1 V vs. a Ag/AgCl/1 M KCl reference electrode. An Image ID:b615188d-t2.gif mechanism is proposed to explain this behaviour involving the initial formation of a thin film of Hg(I) oxide on the electrode which is then oxidised by PN to form HgO in a chemical step. The HgO is then reduced back to Hg(0) at the electrode potential of interest resulting in a net cathodic current. The parameters affecting the voltammetry of PN at a MFE, including the concentration of PN (10−5–10−4 M), the effect of varying scan rate (5–100 mV s−1) and pH are investigated and the kinetics of PN decay in alkaline solutions ranging from pH 9–13 are explored electrochemically.

Graphical abstract: The voltammetric determination of peroxynitrite at a mercury film electrode

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Publication details

The article was received on 18 Oct 2006, accepted on 08 Jan 2007 and first published on 31 Jan 2007


Article type: Paper
DOI: 10.1039/B615188D
Citation: New J. Chem., 2007,31, 394-400
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    The voltammetric determination of peroxynitrite at a mercury film electrode

    E. A. Zakharova, T. A. Yurmazova, B. F. Nazarov, G. G. Wildgoose and R. G. Compton, New J. Chem., 2007, 31, 394
    DOI: 10.1039/B615188D

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