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Chemical Research in Chinese Universities ›› 2004, Vol. 20 ›› Issue (5): 529-533.

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Electrocatalytic Oxidation and Ion Chromatography Detection of S2O32-, SO32-, I- and SCN- at Glassy Carbon Electrode with Functionalized Multi-Wall Carbon Nanotubes Film

XU Ji-ming1,2, WANG Yan-ping2, XIAN Yue-zhong2, JIN Li-tong2   

  1. 1. Department of Chemistry, Huaiyin Teachers College, Huaiyin 223001, P. R. China;
    2. Department of Chemistry, East China Normal University, Shanghai 200062, P. R. China
  • Received:2003-04-28 Online:2004-10-24 Published:2011-08-06
  • Supported by:

    supported by the National Natural Science Foundation of China(No.20175006 ) and Nano Projects from Shanghai Science and Technology Committee (No.0214nm078 and 0359nm002).

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Abstract: In this research, a glassy carbon electrode modified with the functionalized multi-wall carbon nanotubes (MWNT-COOHs) film was used as an amperometric sensor for the determination of S2O32-, SO32-, I- and SCN-.The electrochemical behavior of those oxidizable inorganic anions at this modified electrode was studied by means of cyclic voltammetry(CV).The experimental results indicate that the modified electrode exhibits a high electrocatalytic activity towards the oxidation of those anions with a relatively high sensitivity, a good stability and a long-life.Separated by ion chromatography(IC) with 1.25 mmol/L H2SO4 as an eluent,those oxidizable anions can be determined by the MWNT-COOHs modified electrode successfully.Under the optimal chromatographic conditions, the detection limits are 1.5 × 10-7 mol/L for S2O32-, 2.5 × 10-7 mol/L for SO32-, 1.2 × 10-7 mol/L for I- and 2.0 × 10-7 mol/L for SCN-, respectively.The method was applied successfully to the determination of those anions in environmental water.

Key words: Amperometric detection, MWNT-COOHs, Chemically modified electrode, Ion chromatography