Square wave voltammetric determination of Hg(II) using thiol functionalized chitosan-multiwalled carbon nanotubes nanocomposite film electrode

• Published in: Mikrochimica acta (1966) Vol. 169; no. 3-4; pp. 367 - 373
• Main Authors: Deng, Wenfang, Tan, Yueming, Li, Yunyong, Wen, Yanqing, Su, Zhaohong, Huang, Zhao, Huang, Suqing, Meng, Yue, Xie, Qingji, Luo, Yueping, Yao, Shouzhuo
• Format: Journal Article
• Language: English
• Published: Vienna Vienna : Springer Vienna 01.06.2010; Springer Vienna; Springer
• Subjects: Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Crosslinked polymers; Electric properties; Electrochemical methods; Exact sciences and technology; General, instrumentation; Hg(II); Microengineering; Multiwalled carbon nanotubes; Nanochemistry; Nanotechnology; Nanotubes; Original Paper; Square wave stripping voltammetry; Thiol functionalized chitosan; Thiols; Multiwalled carbon nanotubes; Thiol functionalized chitosan; Hg(II); Square wave stripping voltammetry; Water; Open circuit; Thiol; Electrochemical method; Sample; Mercury II; Carbon electrode; Carbon nanotubes; Voltammetry; Glutaral; Acidic solution; Thin layer electrode; Detection limit; Affinity; Nanocomposite; Yield; Chitosan; Quartz microbalance; Square wave
• ISSN: 0026-3672; 1436-5073
• DOI: 10.1007/s00604-010-0366-5

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.