Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Electrochemistry and Determination of 1-Naphthylacetic Acid Using an Acetylene Black Film Modified Electrode

  • Huang, Wensheng (Key Laboratory of Biological Resources Protection and Utilization of Hubei Province, Hubei Institute for Nationalities,) ;
  • Qu, Wanyun (Key Laboratory of Biological Resources Protection and Utilization of Hubei Province, Hubei Institute for Nationalities,) ;
  • Zhu, Dazhai (Key Laboratory of Biological Resources Protection and Utilization of Hubei Province, Hubei Institute for Nationalities,)
  • Published : 2008.07.20
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Abstract

The acetylene black (AB) was dispersed into water in the presence of dihexadecyl hydrogen phosphate (DHP) via ultrasonication, resulting in a stable and well-distributed AB/DHP suspension. After evaporation of water, an AB/DHP composite film-modified electrode was prepared. The electrochemical responses of $K_3$[Fe$(CN)_6$] at the unmodified electrode, DHP film-modified electrode and AB/DHP film-modified electrode were investigated. It is found that the AB/DHP film-modified electrode possesses larger surface area and electron transfer rate constant. Furthermore, the electrochemical behaviors of 1-naphthylacetic acid (NAA) were examined. At the AB/DHP film-modified electrode, the oxidation peak current of NAA remarkably increases. Based on this, a sensitive and convenient electrochemical method was proposed for the determination of NAA. The linear range is in the range from $4.0 {\times} 10^{-8}\;to\;5.0 {\times} 10^{-6}$ mol $L^{-1}$, and the detection limit is $1.0 {\times} 10^{-8}$ mol $L^{-1}$. Finally, this new sensing method was employed to determine NAA in several soil samples.

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