Electrochemical Determination of the Herbicide Bentazone Using a Carbon Nanotube β‐Cyclodextrin Modified Electrode |
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| Authors: | V Rahemi J M P J Garrido F Borges C M A Brett E M P J Garrido |
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| Institution: | 1. Departamento de Engenharia Química, Instituto Superior de Engenharia do Porto (ISEP), Instituto Politécnico do Porto, 4200‐072 Porto, Portugal;2. CIQ/Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, 4169‐007 Porto, Portugal;3. Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade de Coimbra, 3004‐535 Coimbra, Portugal |
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| Abstract: | An electrochemical sensor has been developed for the determination of the herbicide bentazone, based on a GC electrode modified by a combination of multiwalled carbon nanotubes (MWCNT) with β‐cyclodextrin (β‐CD) incorporated in a polyaniline film. The results indicate that the β‐CD/MWCNT modified GC electrode exhibits efficient electrocatalytic oxidation of bentazone with high sensitivity and stability. A cyclic voltammetric method to determine bentazone in phosphate buffer solution at pH 6.0, was developed, without any previous extraction, clean‐up, or derivatization steps, in the range of 10–80 µmol L?1, with a detection limit of 1.6 µmol L?1 in water. The results were compared with those obtained by an established HPLC technique. No statistically significant differences being found between both methods. |
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| Keywords: | Herbicides Bentazone Voltammetric sensors β ‐Cyclodextrin Carbon nanotubes |
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