ANovelMethod for Ultra Trace Measurement of Bentazon Based on Nanocomposite Electrode and Continuous Coulometric FFTCyclicVoltammetry

Document Type: Original Research Paper

Authors

1 Center of Excellence in Electrochemistry,University of Tehran, Tehran, Iran. Biosensor Research Center, Endocrinology&MetabolismMolecular-Cellular Sciences Institute, Tehran University ofMedical Sciences, Tehran, Iran

2 Biosensor Research Center, Endocrinology&MetabolismMolecular-Cellular Sciences Institute, Tehran University ofMedical Sciences, Tehran, Iran

3 Center of Excellence in Electrochemistry,University of Tehran, Tehran, Iran

Abstract

In this work, a novel electrochemical technique is presented for determination of Bentazon
using a nanocomposite based sensor and Continuous Coulometric Fast Fourier transformation cyclic
voltammetry (CCFFTCV). In this method, the sensor response is in coulomb and is calculated based on
integrating charge changes under the current voltammogram in selected potential range. The new sensor was
constructed using MWCNT mixed with ionic liquid and reduced graphene oxide on a SiC NPs modified carbon
ionic liquid electrode. The experimental conditions were then optimized. The modified electrode has good
electrocatalytic activity toward the oxidation of Bentazon. The presence of the nanoparticles enhanced the
electrochemical signal which increased the sensitivity of the sensor. Moreover, the proposed sensor exhibits good
accuracy, the response time less than 7s, with good repeatability (R.S.D value of 2.3%) and long term stability.
The linear concentrations range of Bentazon was from 1–150 nM with a detection limit of 2.5±0.01×10-10 M.

Keywords