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Abstract

A silver disk electrode (diameter 0.2 mm) and composite silver electrode prepared from a mixture of silver, graphite powder and methacrylate resin (20 % Ag, 20 % graphite, 60 % methacrylate resin) are described. The electrodes prepared were used for the voltammetric determination of nitrate ions in samples of natural and wastewater (detection limit 7 mg L 71). The activation of the electrode surface before each measurement by a time-de®ned polarization ensures the reproducibility of the results of the voltammetric analysis. For the realization of such activation process the use of a computer-controlled instrument is necessary. For the electroanalytical measurement the advantages of the composite electrodes compared to solid silver electrodes includes simple preparation, low cost and electrochemical behavior typical to microelectrode arrays.

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