Voltammetry of hexacyanoferrates using a chemically modified carbon-paste electrode

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Abstract
A simple electroanalytical method for the quantitative determination of hexacyanoferrate(II) and -(III) has been developed using a carbon-paste electrode, chemically modified with a weakly basic anion exchanger. The complexes can be pre-concentrated at the electrode surface prior to voltammetric determination. For differential-pulse voltammetric measurements with suitable methodical parameters, a linear relationship between the current and concentration was found for 0.3 to 6000 µg l–1 of Fe. The method is applicable to the quantitative determination of hexacyanoferrate(II) in wine down to 6 µg l–1 of Fe. Factors influencing the signal response like pre-concentration time and ionic effects have also been investigated.

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