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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 17, Number 12
BKCSDE 17(12)
December 20, 1996 

Differential Pulse Voltammetric Determination of Copper(Ⅰ) Ion with a Rubeanic Acid-Modified Carbon Paste Electrode
Mi-Sook Won, Hyun-Jeong Kim, Yoon-Bo Shim*
A copper(Ⅰ) ion-sensitive modified electrode was constructed by incorporating rubeanic acid into a carbon paste mixture composed of graphite powder and Nujol oil. By simple immersing of the modified electrode into the measuring solution, the test ion was chemically deposited on the electrode via a complex formation. The resulting surface was characterized by cyclic voltammetry and differential pulse voltammetry. The exposure of the used modified electrode to a 0.1 M nitric acid and the potential cycling, beyond more positive and negative potential than the redox potential of the copper complex, led to the reuse of the electrode more than three times. A linear calibration plot was obtained over the concentration range of 5.0×10-6 to 1.0×10-7 M with 5.6% relative standard deviation. The detection limit for Cu(Ⅰ) ion are found to be 5.0×10-8 M using differential pulse voltammetry at 15 min of the deposition. Ag(Ⅰ), Hg(Ⅱ), Ni(Ⅱ ), Co(Ⅱ), Cd(Ⅱ), Pb(Ⅱ), Cr(Ⅱ), AI(Ⅲ), As(Ⅳ), Be(Ⅱ), Mg(Ⅱ), Ca(Ⅱ), Pt(Ⅳ), Se(Ⅳ), Zn(Ⅱ), Tl(Ⅰ), Hg(Ⅱ), and Fe(Ⅱ) ions did not interfere. After the reduction of Cu(Ⅱ) ion to Cu(Ⅰ) with hydroxylamine in the sample solution, satisfactory results were obtained for the determination of copper in the certified standard urine reference material, SRM's 2670 (trace elements in the urine).
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