Electrochemical Determination of the Herbicide Bentazone Using a Carbon Nanotube β‐Cyclodextrin Modified Electrode

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 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 mmol L À1 , with a detection limit of 1.6 mmol L À1 in water. The results were compared with those obtained by an established HPLC technique. No statistically significant differences being found between both methods.

Carbon nanotube β-cyclodextrin-modified electrode for quantification of cocaine in seized street samples

“…Carbon-based nanomaterials, such as carbon nanotubes (CNT), have been extensively explored due to their promising sensor applications and diverse advantages, such as a high surface-to-volume ratio, high electrical conductivity, chemical stability, biocompatibility and robust mechanical strength [12,13]. Nanocomposites of β-cyclodextrin (β-CD) and multi-walled CNT (MWCNT) have recently been successfully used to study and quantify a variety of organic molecules owing to the synergistic effect of both materials [14][15][16][17]. The usefulness of CDs is related to their unique structures and to the fact that CDs retain their analyterecognizing and entrapping properties under a relatively broad range of experimental conditions [18][19][20][21][22].…”

An Overview of Pesticide Monitoring at Environmental Samples Using Carbon Nanotubes-Based Electrochemical Sensors

“…Moreover, the authors demonstrated the excellent operation lifetime and selectivity of the proposed voltammetric sensor. This same sensor architecture was later applied for the determination of berbicide bentazone [79] and MCPA and its metabolite 4-chloro-2-methylphenol [88]. Again, linear concentration ranges and detection limits at micromolar levels were obtained, as well as excellent accuracy.…”

“…A sequence of papers was reported by Rahemi et al [79,88,89] dedicated to the construction of pesticide electrochemical sensors based on β-cyclodextrin and carbon nanotubes. Cyclodextrin molecules are cyclic oligosaccharides formed of six to twelve α-D-glucopyranose monomers, which are linked by 1 and 4 carbon atoms [106].…”

Carbon nanotube β-cyclodextrin modified electrode as enhanced sensing platform for the determination of fungicide pyrimethanil

“…Composite materials formed with CNT have also been prepared with the aim of improving operational characteristics of the resulting sensors in terms of selectivity, stability or sensitivity. Nanocomposites of bcyclodextrin (b-CD) and multiwalled CNT (MWCNT) deposited on a glassy carbon electrode (GCE) have recently been successfully used to study and quantify many organic molecules owing to the synergistic effect of both materials (Rahemi et al, 2012(Rahemi et al, , 2013Shen & Wang, 2009). The great significance of cyclodextrins lies in their ability to selectively form inclusion complexes (hosteguest complexes) with many organic and biological molecules.…”