Square wave voltammetric determination of Hg(II) using thiol functionalized chitosan-multiwalled carbon nanotubes nanocomposite film electrode
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- 作者：Wenfang Deng ; Yueming Tan ; Yunyong Li ; Yanqing Wen ; Zhaohong Su ; Zhao Huang ; Suqing Huang ; Yue Meng ; Qingji Xie and Yueping Luo ; et al.
- 关键词：Thiol functionalized chitosan ; Multiwalled carbon nanotubes ; Hg(II) ; Square wave stripping voltammetry
- 刊名：Microchimica Acta
- 出版时间：June, 2010
- 出版年：2010
- 期刊代码：95_0026-3672
- 类别：ch
- 卷：169
- 期：3-4
- 页码：367-373
- 数据来源：sp
摘要
Covalent tethering of cysteamine to chitosan using glutaraldehyde yields thiol-functionalized chitosan (CS-SH). It was cast on a glassy carbon electrode which is found to be very stable in acidic solutions and to possess a strong affinity for Hg(II) ions as confirmed by quartz crystal microbalance measurements. A glassy carbon electrode modified with a nanocomposite made from CS-SH and multiwalled carbon nanotubes was applied for square wave voltammetric determination of Hg(II). The procedure comprises the steps of (a) chemical accumulation of Hg(II) under open-circuit condition and (b) electrochemical determination of Hg(II). Linear responses are obtained in the range from 10 to 140 nM, with a limit of detection of 3 nM (S/N = 3) under optimized conditions. The electrode was applied to the determination of Hg(II) in water samples with satisfactory recoveries.