Totka Dodevska

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The electrocatalytic activities of a series of compact graphites modified with microquantities of platinum metals (Pd or Pt+Pd) towards the electrochemical reduction of hydrogen peroxide were characterised. Operational parameters such as the optimal working potential, the influence of temperature and the resulting electrode characteristics were examined.(More)
An interference-free amperometric biosensor for the quantitative xanthine analysis is described. Xanthine was monitored through the electrochemical reduction of hydrogen peroxide (produced upon its enzyme-catalyzed oxidation) at a constant applied potential of -50 mV (vs. Ag/AgCl). The biosensor was designed on the basis of a graphite electrode modified(More)
For a series of graphite electrodes, modified with microquantities of Pd+Pt mixture in varied proportions, surface morphology of the catalytically active phase was studied with scanning electron microscopy (SEM), while the catalytic activity was examined at electrochemical reduction of hydrogen peroxide by means of steady-state polarization curves and(More)
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