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KMID : 1059519930370080723
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Journal of the Korean Chemical Society
1993 Volume.37 No. 8 p.723 ~ p.729
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Voltammetric Determination of Cu(II) Ion at a Chemically Modified Carbon-Paste Electrode Containing 1-(2-pyridylazo)-2-naphthol
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Bae Zun-Ung
Jun Hee-Sook
Chang Hye-Young
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Abstract
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Cu(Ⅱ) ion-responsive chemically modifed electrodes (CMEs) were constructed by incorporating 1-(2-pyridylazo)-2-naphthol (PAN) into a conventional carbon-paste mixture of graphite powder and Nujol oil. Cu(Ⅱ) ion was chemically deposited on the surface of the PAN-chemically modified electrode in the absence of an applied potential by immersion of the electrode in a buffer solution (pH 3.2) containing Cu(Ⅱ) ion, and then reduced at a constant potential in 0.1 M KNO3. And a well-defined voltammetric peak could be obtained by scanning the potential to the positive direction. The electrode surface could be regenerated with exposure to acid solution and reused for the determination of Cu(Ⅱ) ion. In 5 deposition / measurement / regeneration cycles, the response could be reproduced with 6.1% relative standard deviation. In case of using the differential pulse voltammetry, the calibration curve for Cu(Ⅱ) was linear over the range of 2.0 × 10-7 ∼ 1.0 × 10-6 M. And the detection limit was 6.0 × 10-8 M. Studies of the effect of diverse ions showed that Co, Ni, Zn, Pb, Mg and Ag ions added 10 times more than Cu(Ⅱ) ion did not influence on the determination of Cu(Ⅱ) ion, except EDTA and oxalate ions.
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