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Determination of Ag(Ⅰ) Ion with a Chemically Modified Carbon Paste Electrode Containing Cinchonidine
Determination of Ag(Ⅰ) Ion with a Chemically Modified Carbon Paste Electrode Containing Cinchonidine
Journal of the Korean Chemical Society. 1994. Oct, 38(10): 734-740
  • Published : October 00, 1994
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Kim, Sin Hui
Won, Mi Suk
Sim, Yun Bo

Abstract
Electrochemical determination of Ag(I) 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(I) ion was shown to be $1.0 {\times}10^{-6}$ M in conventional CV and up to $8.0{\times}10^{-9}$ M (${\pm}$0.6%) using DPV. The optimum analytical condition of Ag(I) 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(I) ion except Hg(II) ion was decreased roughly 25% compare to Ag(I) ion only. When Mn(II) ion was present in sample solution at pH 9, shown a large interference effect.