Multiwalled Carbon Nanotube Chemically Modified Gold Electrode for Inorganic As Speciation and Bi(III) Determination

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• 作者：Antonella Profumo ; Maurizio Fagnoni ; Daniele Merli ; Eliana Quartarone ; Stefano Protti ; Daniele Dondi ; and Angelo Albini
• 刊名：Analytical Chemistry
• 出版年：2006
• 出版时间：June 15, 2006
• 年：2006
• 卷：78
• 期：12
• 页码：4194 - 4199
• 全文大小：288K
• 年卷期：v.78,no.12(June 15, 2006)
• ISSN：1520-6882

文摘

A chemically modified gold electrode has been conveniently prepared by binding multiwalled carbon nanotubes(MWCNTs) to which thiol functions have been tethered.The electrode has been characterized by atomic forcemicroscopy and oxidative desorption experiments andgives excellent results for trace determination of As(III)and Bi(III) in natural and high-salinity waters, overcomingthe limitation typical of solid electrodes. A mechanism forAs(III) preconcentration at the electrode is proposed andsupported by results obtained by two similar chemicallymodified electrodes (CMEs), the first one prepared withsingle-walled carbon nanotubes and the second one witha monolayer of (biphenyl)dimethanethiol. The performance obtained with the MWCNTs-CME largely overcomes that obtained by using other devices.