KMID : 1059519940380100734
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Journal of the Korean Chemical Society 1994 Volume.38 No. 10 p.734 ~ p.740
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Determination of Ag(¥°) Ion with a Chemically Modified Carbon Paste Electrode Containing Cinchonidine
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Kim Sheen-Hee
Won Mi-Sook Shim Yon-Bo
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Abstract
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Electrochemical determination of Ag(¥°) ion was carried out by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) with the carbon paste electrode (CPE) containing cinchonidine. The detection limit for Ag(¥°) ion was shown to be 1.0 ¡¿ 10-6 M in conventional CV and up to 8.0 ¡¿ 10-9 M (¡¾0.6%) using DPV. The optimum analytical condition of Ag(¥°) ion was determined as follows: pH 7, 20 minutes of deposition time, and 50% (w/w) cinchonidine to carbon powder composition of electrode. The interference effect of various metal ions added to the deposition solution was also studied. The peak current of Ag(¥°) ion except Hg(¥±) ion was decreased roughly 25% compare to Ag(¥°) ion only. When Mn(¥±) ion was present in sample solution at pH 9, shown a large interference effect.
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