A Novel Method for Ultra Trace Measurement of Bentazon Based on Nanocomposite Electrode and Continuous Coulometric FFT Cyclic Voltammetry

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.