Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/7485
Título: Electrochemical sensor for simultaneous determination of herbicide MCPA and its metabolite 4-chloro-2-methylphenol. Application to photodegradation environmental monitoring
Autor: Rahemi, V.
Garrido, J. M. P. J.
Borges, F.
Brett, C. M. A.
Garrido, E. M. P. J.
Palavras-chave: Herbicides
Voltammetric sensor
Carbon nanotubes
Data: 2015
Editora: Springer
Relatório da Série N.º: Environmental Science and Pollution Research;Vol. 22, Issue 6
Resumo: The development and application of a polyaniline/carbon nanotube (CNT) cyclodextrin matrix (PANI-β-CD/MWCNT)-based electrochemical sensor for the quantitative determination of the herbicide 4-chloro-2-methylphenoxyacetic acid (MCPA) and its main transformation product 4-chloro-2-methylphenol in natural waters are described. A simple cyclic voltammetry-based electrochemical methodology, in phosphate buffer solution at pH 6.0, was used to develop a method to determine both MCPA and 4-chloro-2-methylphenol, without any previous extraction or derivatization steps. A linear concentration range (10 to 50 μmol L−1) and detection limits of 1.1 and 1.9 μmol L−1, respectively, were achieved using optimized cyclic voltammetric parameters. The proposed method was successfully applied to the determination of MCPA and 4-chloro-2-methylphenol in natural water samples with satisfactory recoveries (94 to 107 %) and in good agreement with the results obtained by an established high-performance liquid chromatography technique, no significant differences being found between the methods. Interferences from ionic species and other herbicides used for broad-leaf weed control were shown to be small. The newly developed methodology was also successfully applied to MCPA photodegradation environmental studies.
URI: http://hdl.handle.net/10400.22/7485
DOI: 10.1007/s11356-014-3693-y
ISSN: 0944-1344
Versão do Editor: http://link.springer.com/article/10.1007/s11356-014-3693-y
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