应用化学 ›› 2009, Vol. 26 ›› Issue (07): 875-877.

• 研究简报 • 上一篇    下一篇

多壁碳纳米管修饰乙炔炭黑微电极测定碘

邓培红,,,   

  1. 衡阳师范学院
  • 收稿日期:2008-07-14 修回日期:2009-01-23 出版日期:2009-07-10 发布日期:2009-07-10
  • 通讯作者: 邓培红

Determination of iodine using a multi-wall carbon nanotubes modified acetylene black microelectrode

  • Received:2008-07-14 Revised:2009-01-23 Published:2009-07-10 Online:2009-07-10

摘要: 以多壁碳纳米管修饰乙炔炭黑微电极为工作电极,研究了碘离子在该修饰电极上的阳极溶出伏安特性。在0.1 mol/L KH2PO4 缓冲液(pH4.0)中,从200 mV以200 mV/s的速率正向扫描至1200 mV,碘离子在570 mV处出现一灵敏的阳极溶出峰。峰电流与碘离子的浓度在2.0×10-6~1.0×10-3 mol/L范围内呈良好的线性关系,检出限为8.0×10-7 mol/L。方法用于食盐中碘含量的测定,结果满意。

关键词: 化学修饰电极, 多壁碳纳米管, 碘离子, 阳极溶出伏安法

Abstract: In this paper, a multi-wall carbon nanotubes modified acetylene black microelectrode was prepared and the anodic stripping voltammetric characteristics of iodine on the modified electrode was studied. The results showed that in 0.1 mol/L KH2PO4 solution (pH4.0), when scanning linearly from 200mV to 1200mV at a scan rate of 200 mV/s, a sensitive anodic stripping peak appears at 570 mV (vs. SCE). Good linearity is kept between the oxidation peak current and the concentration of iodine ion in the range of 2.0×10-6~1.0×10-3 mol/L, the detection limit reached 8.0×10-7 mol/L. This method was successfully applied to determination of iodine in edible salt.

Key words: Chemical modified electrode, Multi-wall carbon nanotubes, Iodine ion, Anodic stripping voltammetry

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