Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Low Potential Amperometric Determination of Ascorbic Acid at a Single-Wall Carbon Nanotubes-Dihexadecyl Hydrogen Phosphate Composite Film Modified Electrode

  • Fei, Junjie (College of Chemistry, Key Laboratory of Advanced Materials & Rheological Properties of Ministry of Education, Xiangtan University) ;
  • Wu, Kangbing (Department of Chemistry, Huazhong University of Science and Technology) ;
  • Yi, Lanhua (College of Chemistry, Key Laboratory of Advanced Materials & Rheological Properties of Ministry of Education, Xiangtan University) ;
  • Li, Junan (College of Chemistry, Key Laboratory of Advanced Materials & Rheological Properties of Ministry of Education, Xiangtan University)
  • Published : 2005.09.20
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Abstract

A sensitive and selective electrochemical method was developed for the amperometric determination of ascorbic acid (AA) at a glassy carbon electrode (GCE) modified with single-wall carbon nanotubesdihexadecyl hydrogen phosphate (SWNT-DHP) composite film. The SWNT-DHP composite film modified GCE was characterized with SEM. The SWNT-DHP composite film modified GCE exhibited excellent electrocatalytic behaviors toward the oxidation of AA. Compared with the bare GCE, the oxidation current of AA increased greatly and the oxidation peak potential of AA shifted negatively to about -0.018 V (vs. SCE) at the SWNT-DHP composite film modified GCE. The experimental parameters, which influence the oxidation current of AA, were optimized. Under the optimal conditions, the amperometric measurements were performed at a applied potential of -0.015 V and a linear response of AA was obtained in the range from 4 ${\times}$ $10^{-7}$ to 1 ${\times}$ $10^{-4}$ mol $L^{-1}$ and with a limit of detect (LOD) of 1.5 ${\times}$ $10^{-7}$ mol $L^{-1}$. The interferences study showed that the SWNT-DHP composite film modified GCE exhibited good sensitivity and excellent selectivity in the presence of high concentration uric acid and dopamine. The proposed procedure was successfully applied to detect AA in human urine samples with satisfactory results.

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