Electrocatalytic Oxidation and Determination of Sulfite with a Novel Copper-Cobalt Hexacyanoferrate Modified Carbon Paste Electrode

The electrocatalytic oxidation of sulfite has been studied at a stable electroactive thin film of copper-cobalt hexacyanoferrate (CuCoHCF) hybrid electrodeposited oil a carbon paste electrode (ECMCPE). A linear range of 5 mu M to 5 mM of sulfite, with all experimental detection limit of 1 mu M, was obtained using the cyclic voltammetric method. The oxidation of sulfite showed no significant fouling effect oil the modified electrode surface at sulfite concentrations below 5 mM. The proposed modified electrode exhibited several attractive features, including simple preparation, fast response, good stability and repeatability, and could be applied to sulfite determination in real samples.