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Sensors 2008, 8(8), 5096-5105; doi:10.3390/s8085096
Article

Electrocatalytic Detection of Amitrole on the Multi-Walled Carbon Nanotube – Iron (II) tetra-aminophthalocyanine Platform

1
, 2,*  and 1
1 Department of Chemistry, Rhodes University, Grahamstown 6140, South Africa 2 Molecular and Nanomaterials Electrochemistry Laboratory, Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa
* Author to whom correspondence should be addressed.
Received: 21 May 2008 / Revised: 9 June 2008 / Accepted: 11 June 2008 / Published: 27 August 2008
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Abstract

It is shown that iron(II) tetra-aminophthalocyanine complex electropolymerized onto a multi-walled carbon nanotube-modified basal plane pyrolytic graphite electrode greatly enhanced the electrocatalytic detetion of amitrole (a toxic herbicide), resulting in a very low detection limit (0.5 nM) and excellent sensitivity of 8.80±0.44 μA/nM, compared to any known work reported so far. The electrocatalytic detection of amitrole at this electrode occurred at less positive potential (~0.3 V vs Ag|ACl) and also revealed a typical coupled chemical reaction. The mechanism for this response is proposed. The electrode gave satisfactory selectivity to amitrole in the presence of other potential interfering pesticides in aqueous solutions.
Keywords: Amitrole; tetra-aminophthalocyanine; electropolymerization; multi walled carbon nanotubes; basal plane pyrolytic graphite electrode Amitrole; tetra-aminophthalocyanine; electropolymerization; multi walled carbon nanotubes; basal plane pyrolytic graphite electrode
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Siswana, M.; Ozoemena, K.I.; Nyokong, T. Electrocatalytic Detection of Amitrole on the Multi-Walled Carbon Nanotube – Iron (II) tetra-aminophthalocyanine Platform. Sensors 2008, 8, 5096-5105.

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