Abstract
Fabrication of the graphite based polymer composite electrodes and their application to the stripping analysis is described. The electrode was prepared by filling and extruding the styrene-acrylonitrile copolymer (SA) with graphite powder, which shows significant improvement in signal to noise ratio in comparison with a conventional glassy carbon electrode especially at the anodic potential range. It is demonstrated that the electrodes are well suited for the determination of trace manganese in aqueous solution by cathodic stripping voltammetry (CSV). This method involves a preelectrolysis step whereby the trace Mn(II) was anodically oxidized to Mn(IV) on an electrode surface in an acetate ammonium buffer (pH 9), followed by cathodic stripping technique with a square-wave voltammetric mode. The peak response was characterized with respect to pH, preelectrolysis potential, preelectrolysis time, possible interference, supporting electrolytes, etc. Under the optimal conditions, the stripping peak height linearly increased with the concentration of manganese in the range of 0.2–10 µg/L. The sensitivity and the resolution of the proposed method are obviously better than that of results obtained with the conventional glassy carbon electrode.
Published Version
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