Development of electrochemical sensor based on modified electrode for the determination of carbendazim

In this study, the development of an electrochemical sensor was examined based on the preparation of a modified electrode in order to produce a method highly sensitive, selective, simple and rapid determination of (CBZ) fungicide. Firstly, nanocomposite consisting of fumed silica decorated with silver nanoparticles (FS@Ag) was synthesized. Secondly, the carbon paste electrode was modified with the prepared modified agent and a voltammetric method was proposed for carbendazim quantification. Modification agent and modified electrode surface were characterized by X-ray diffraction, EDX mapping and scanning electron microscopy analysis. Modified electrodes were also electrochemically characterized using cyclic voltammetry and electrochemical impedance spectroscopy analysis. The modified electrode showed an electrocatalytic effect in the oxidation of carbendazim. Development of the method for the determination of carbendazim was involved optimizing experimental parameters including the percentage of modification agent, pH and accumulation time. The performance of the prepared electrochemical sensor has been investigated in real samples such as river water, orange and apple juice, and tomatoes samples. With this proposed method, a low limit of detection (0.000940 μM) and a low limit of quantification (0.003134 μM) and a wide linear range (0.05 – 10.0 μM) were obtained for CBZ analysis. The results showed that the electrochemical sensor prepared here can be used as an alternative to current analytical methods used for the measurement of carbendazim.