中华医学超声杂志

应用化学 ›› 2011, Vol. 28 ›› Issue (08): 969-973.DOI: 10.3724/SP.J.1095.2011.00003

• 研究论文 • 上一篇    下一篇

聚对氨基苯磺酸/石墨烯修饰玻碳电极伏安法测定痕量汞

许春萱*,熊小琴,吴莹莹,马文杰   

  1. (信阳师范学院化学化工学院 信阳 464000)
  • 收稿日期:2011-01-05 修回日期:2011-03-10 出版日期:2011-08-10 发布日期:2011-08-10
  • 通讯作者: 许春萱，副教授; Tel:0376-6390611; Fax:0376-6390597; E-mail:xuchunxuan0702@126.com; 研究方向：生物传感器
  • 基金资助:
    (College of Chemistry and Chemical Engineering,Xinyang Normal University,Xinyang 464000)

Determination of Trace Amount of Mercury Using Poly(p-Aminobenzene Sulfonic Acid)/Graphene Modified Glassy Carbon Electrode

XU Chunxuan*, XIONG Xiaoqin, WU Yingying, MA Wenjie   

  1. (College of Chemistry and Chemical Engineering,Xinyang Normal University,Xinyang 464000)
  • Received:2011-01-05 Revised:2011-03-10 Published:2011-08-10 Online:2011-08-10

PDF

2175

被引次数

39 | 4

摘要：

制备了对氨基苯磺酸/石墨烯复合膜修饰电极，研究了汞在修饰电极上的电化学行为。 在0.1 mol/L、pH=4.0的磷酸盐缓冲液中，以此修饰电极为工作电极，在-1.2 V搅拌富集5 min，用差分脉冲伏安法测定0.31 V处的溶出峰电流。 结果表明，该电极显著提高了汞离子的电化学响应信号。 在优化条件下，峰电流与Hg2+的浓度在1.0×10-6~5.0×10-4 mol/L范围内呈良好的线性关系，相关系数为0.995。 方法的检出限为5.0×10-7 mol/L。 将该法用于水样中痕量汞的测定，回收率为92.2%~105.2%。

关键词: 聚对氨基苯磺酸, 石墨烯, 差分脉冲伏安法, 汞, 化学传感器

Abstract:

A poly(p-aminobenzene sulfonic acid)/graphene composite modified glassy carbon electrode(GCE) was fabricated and the electrochemical behaviors of mercury on the modified electrode were investigated. The results show that the electrochemical response of Hg2+ at the modified electrode is significantly improved compared with the bare GCE. After 5 min accumulation at -1.2 V in a 0.1 mol/L pH=4.0 PBS, the peak currents vary linearly with the concentration of Hg2+ over the range from 1.0×10-6 to 5.0×10-4 mol/L with the detection limit of 5.0×10-7 mol/L. The correlation coefficiency is 0.995. Using this modified electrode, trace amounts of Hg2+ in water samples are determined with recoveries of 92.2%~105.2%.

Key words: Poly(p-aminobenzene sulfonic acid), Graphene, Differential pulse voltammetry, Mercury, Chemical sensor

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