Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 89, Issue -, Pages 175-181Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfb.2011.09.010
Keywords
Triazophos; Carbon nanotube; Electrochemical sensor; Molecular imprinting
Funding
- National Natural Science Foundation of the People's Republic of China [20875070]
- Science and Technology Project of Anhui Province [1106c0805007]
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An electrochemical sensor for pesticide triazophos (TAP) was prepared by deposition of gold nanoparticles (AuNPs) on carbon nanotubes (CNTs) modified glassy carbon (GC) electrode surface using a potentiostatic method, followed by electropolymerizing of o-hydroxyphenol at the AuNP/CNT/GC electrode surface in the presence of template triazophos via cyclic voltammetry. The electrochemical response of triazophos at the TAP-imprinted polyhydroxyphenol (PHP) modified AuNP/CNT/GC (PHP/AuNP/CNT/GC) electrode was investigated by cyclic voltammetry. The cyclic voltammetric response of triazophos at the TAP-imprinted PHP/AuNP/CNT/GC electrode was significantly higher than that at bare GC, CNT/GC, AuNP/CNT/GC, imprinted PHP/CNT/GC and non-imprinted PHP/AuNP/CNT/GC electrodes. The results indicated that the TAP-imprinted PHP/AuNP/CNT/GC electrode can effectively improve the reductive properties of triazophos and eliminate interferences of other pesticides. In addition, the AuNPs can strikingly amplify the electrochemical response of triazophos and improve the sensitivity to triazophos. Finally, the electrochemical sensor was successfully applied to determination of triazophos in vegetable samples with satisfactory results. (C) 2011 Elsevier B.V. All rights reserved.
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