Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Amperometric Determination of Nitrite at Poly(Methylene Blue)-Modified Glassy Carbon Electrode

  • Xu, Guang-Ri (Henan Institute of Science and Technology) ;
  • Xu, Guifang (Henan Institute of Science and Technology) ;
  • Xu, Ming-Lu (Henan Institute of Science and Technology) ;
  • Zhang, Zhengqing (Henan Institute of Science and Technology) ;
  • Tian, Yuan (School of Chemistry and Chemical Engineering, Henan University of Technology) ;
  • Choi, Han-Nim (Department of Chemistry and Center for Bioactive Molecular Hybrids, Yonsei University) ;
  • Lee, Won-Yong (Department of Chemistry and Center for Bioactive Molecular Hybrids, Yonsei University)
  • Received : 2011.09.23
  • Accepted : 2011.11.26
  • Published : 2012.02.20
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Abstract

Electrochemical characteristics of nitrite ion were investigated at a poly(methylene blue)-modified glassy carbon electrode by cyclic voltammetry and differential pulse voltammetry. The poly(methylene blue)-modified glassy carbon electrode exhibited enhanced anodic signals for nitrite. The effects of key parameters on the detection of nitrite were evaluated at the modified electrode, such as pH, accumulation time, and scan rate. Under optimum condition, the chemically modified electrode can detect nitrite in the concentration range $2.0{\times}10^{-6}$ to $5.0{\times}10^{-4}$ M with the detection limit of $2.0{\times}10^{-6}$ M and a correlation coefficient of 0.999. The detection of nitrite using the chemically modified electrode was not affected by common ions such as $Na^+$, $K^+$, $Ca^{2+}$, $Cl^-$, $HPO_4^{2-}$ and $H_2PO_4^- $. The modified electrode showed good stability and reproducibility. The practical application of the present method was successfully applied to the determination of nitrite ion in cabbage samples.

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