Simultaneous Determination Of Catechol And Hydroquinone At Poly-p-(asa)mwcnt Compsite Modified Glassy Carbon Electrode

A simple and highly selective electrochemical method for simultaneous determination ofrnhydroquinone and catechol has been developed at a glassy carbon electrode modified withrnmultiwalled carbon nanotubes (MWCNT) and poly-para-amidosalicyclic acid (poly-p-ASA). Itrnwas found that the oxidation peak potential separation and the oxidation currents ofrnhydroquinone and catechol highly increase at the polymer and MWCNT modified glassy carbonrnelectrode in 0.10 M phosphate buffer solution (pH 7.0). The oxidation peak potential ofrnhydroquinone and catechol merge into a large peak at 430.71 mV at bare glassy carbonrnelectrode. The two well-defined oxidation peaks of hydroquinone in the presence of catechol atrnpoly-p-(ASA), MWCNT and composite modified electrode occur at 136.52 mV and 228.04 mV,rn161.29 mV and 262.82 mV and 172.12 mV and 286.85 mV respectively. Under the optimizedrncondition, the oxidation peak current of hydroquinone is linear over a range from 2.0×10-5 M torn7.0×10-4 M hydroquinone in the presence of 1.0×10-3 M catechol with the detection limit ofrn1.2×10-6 M and the oxidation peak current of catechol is linear over a range from 2.0×10-5 M torn6.0×10-4 M catechol in the presence of 1.0×10-3 M hydroquinone with the detection limit of 1.4rn×10-7 M. The proposed method has been applied to the simultaneous determination ofrnhydroquinone and catechol in a water sample and the results are satisfactory.rnKEYWORDSrnElectrochemistry, Electropolymerization, Multiwalled carbon Nanotubes, chemically modifiedrnelectrode, Hydroquinone, Catechol and para-amidosalicyclic acid

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