Electrochemical determination of the herbicide bentazone using a carbon nanotub...

• Author(s): Rahemi, V. ; Garrido, Jorge ; Borges, Fernanda ; Oliveira-Brett, A. M. ; Garrido, E. Manuela
• Date: 2013
• Persistent ID: http://hdl.handle.net/10400.22/3525
• Origin: Repositório Científico do Instituto Politécnico do Porto
• Subject(s): Herbicides; Bentazone; Voltammetric sensors; b-Cyclodextrin; Carbon nanotubes
• Document Type: Article
• Language: English

Description

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 b-cyclodextrin (b-CD) incorporated in a polyaniline film. The results indicate that the b-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 mmolL 1, with a detection limit of 1.6 mmolL 1 in water. The results were compared with those obtained by an established HPLC technique. No statistically significant differences being found between both methods.