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Differential Pulse Voltammetric Determination of Co(II) Ion with a Chemically Modified Carbon Paste Electrode Containing <TEX>${\iota}$</TEX> -Sparteine
Differential Pulse Voltammetric Determination of Co(II) Ion with a Chemically Modified Carbon Paste Electrode Containing ${\iota}$ -Sparteine
Journal of the Korean Chemical Society. 1993. Oct, 37(10): 881-887
  • Published : October 20, 1993
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Jeong, Eu-Duck
Won, Mi-Sook
Park, Deog-Su
Shim, Yoon-Bo
Choi, Sung-Nak

Abstract
A cobalt(II) ion-selective carbon-paste electrode (CPE) was constructed with ${\iota}$-sparteine. Cobalt(II) ion in aqueous solution was chemically deposited through the complexation with ${\iota}$-sparteine onto the CPE. The surface of CPEs were characterized by cyclic voltammetry and differential pulse voltammetry in an acetate buffer solution, separately. Exposure of the CPEs to an acid solution could regenerate surface to reuse it for the deposition. In more than 5 deposition / measurement / regeneration cycles, the response was reproducible and linear up to $5.0{\times}10^{-6}$M with linear sweep voltammetry. The peaks at 0.17V / 0.27V were correspond to the redox of Co(II)-SP complex deposited on CPE. The anodic peak of which appeared after scan over the cathodic peak of 0.17 V to more negative scan. In case of using the differencial pulse voltammetry (DPV), we have obtained the linear response $2.0{\times}10^{-7}$M with relative standard deviation ${\pm}5.6%$. The detection limit was $1.0{times}10^{-7}$M for 20 minutes of the deposition. We have also investigated the interference effect of various metal ions, which are expected to form the complex with the ligand on the electrode.