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Electrocatalytic behaviour of several cobalt complexes: Determination of hydrazine at neutral pH

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Abstract

Four cobalt complexes (cobalt(II) acetylacetonate and 8-hydroxyquinolinate and cobalt(III) 8-hydroxyquinolinate and diethyldithiocarbamate) were tested as mediators to modify carbon paste electrodes with a view to obtaining a catalytic effect for the hydrazine. Cobalt(II) acetylacetonate was found to exert no catalytic effect as the likely result of ligand having to stabilize higher oxidation states of Co potentially involved in the catalytic process. The effects of the electrolyte and pH were examined and found to be important. The proposed chronoamperometric determination for hydrazine features limits of detection at the 99% confidence level of 1.6mM with cobalt(III) diethyldithiocarbamate, 1.5mM with cobalt(III) 8-hydroxyquinolinate and 2.0mM with Co(II) 8-hydroxyquinolinate. The RSD for 2mM hydrazine was always less than 8%.

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Authors and Affiliations

  1. Group of Analytical Spectroscopy and Sensors, Department Analytical Chemistry, Faculty of Sciences, University of Zaragoza, Campus Plaza San Francisco, E-50009, Zaragoza, Spain

    G. Cepria´ & J. R. Castillo

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  1. G. Cepria´
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  2. J. R. Castillo
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Cepria´, G., Castillo, J.R. Electrocatalytic behaviour of several cobalt complexes: Determination of hydrazine at neutral pH. Journal of Applied Electrochemistry 28, 65–70 (1998). https://doi.org/10.1023/A:1003249802216

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