RAPID ELECTROCHEMICAL DETECTION OF CARBENDAZIM IN VEGETABLES BASED ON CARBOXYL FUNCTIONALIZED MULTI-WALLED CARBON NANOTUBES

Keywords: Carbendazim, pesticide residuals, electrochemical sensor, MWCNTs-COOH.

Abstract

At present, the commonly used methods for the detection of benzimidazole fungicides include high performance liquid chromatography (HPLC), liquid chromatography-mass spectrometry (LC-MS), fluorescence spectrometry and so on. These methods have high sensitivity and accurate results, but they have disadvantages such as complicated pretreatment, long time consuming, expensive equipment and professional operators. Electrochemical sensor detection method has the advantages of high sensitivity, simple operation, low cost and easy on-site inspection, etc., which has attracted extensive attention in the field of pesticide residue detection and analysis. In order to realize the rapid detection of carbendazim content in vegetables, an electrochemical rapid detection method was established by using Carboxyl Functionalized Multi-Walled Carbon Nanotubes (MWCNTs-COOH) modified glassy carbon electrode. In this study, MWCNTs-COOH with special functional groups and large specific surface area were used to modify electrodes to improve the adsorption and enrichment of CBZ on the electrode and amplify the electrochemical signal, aiming to establish a highly sensitive electrochemical rapid detection technology for CBZ. The results showed that: the modified electrode functionalized with MWCNTs-COOH could significantly improve the electron transfer rate on the electrode surface, which made the detection sensitivity of carbendazim higher. The linear range of detection was 0,3 μM~20 μM, and the detection limit was determined as low as 0,06 μM. In this study, MWCNT-COOH with better conductivity, adsorption and stability was used to modify electrode, and constructed the MWCNT-COOH/GCE, which improved the adsorption and accumulation of CBZ, effectively promoted the electron transfer on the surface of the electrode, accelerated the response speed of the electrode and improved the current response, to realize the rapid and sensitive detection of trace CBZ in vegetables. This method had high sensitivity, good anti-interference, and detection stability. It was of great significance to detect carbendazim in vegetables.

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Published
2022-05-24
How to Cite
Fang, L., Xinfa, W., Dubovyk, V. I., & Runqiang, L. (2022). RAPID ELECTROCHEMICAL DETECTION OF CARBENDAZIM IN VEGETABLES BASED ON CARBOXYL FUNCTIONALIZED MULTI-WALLED CARBON NANOTUBES. Bulletin of Sumy National Agrarian University. The Series: Agronomy and Biology, 46(4), 76-82. https://doi.org/10.32845/agrobio.2021.4.11