The polyvinyl alcohol modified carbon paste electrode was prepared by grinding the 15mg of polyvinyl alcohol with the mixture of graphite powder and silicon oil of ratio 70%:30% by weight. The voltammetric response of dopamine at modified carbon paste electrode was excellent when compared to traditional carbon paste electrode at sweep rate of 100mV/s in the potential range from-250 to 600mV. The voltammogram of dopamine was reversible. The effect of scan rate showed that the electrode process was diffusion controlled. The concentration and pH effects on the voltammogram of dopamine were studied. The modified carbon paste electrode was better in simultaneous determination of dopamine in presence of large excess of ascorbic acid.
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Chandra et al. (2009) studied this question.
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