An ultrasensitive electrochemical sensing platform for thiamethoxam detection using novel iron-organic framework anchored graphite rod electrode

Neonicotinoids are used more frequently in agricultural seed treatments, resulting in environmental pollution and food contamination. For this end, there is a need for the development of highly reliable and effective electroanalytical platforms in such a way that obtain affordable, low-cost, and highly sensitive sensors for the determination of neonicotinoid molecules. In this experiment, our investigation testifies and characterizes the novel free-standing electrochemical sensing platform for ultrasensitive detection of thiamethoxam using an iron metal organic framework (Fe-MOF) hybrid graphite rod. Wheat-seed-like Fe/BPDCA@GRP/MOF was developed via single-step facile solvothermal treatment. In Fe/BPDCA@GRP/MOF electrode provides a large exterior area, an enormous number of pores and an abundance of active sites, which enhance absorption mechanism of thiamethoxam (TMX). This wheat-seed-like MOF hybrid GRP electrode showed superior electrochemical sensing properties and excellent electrocatalytic activity against selected analytes. Different characterization techniques were used to characterize this composite that had been developed. As-proposed electrode exhibited a lined dynamic response (LDR) from 5 to 100 μM, with lower limit of detection (LOD) of 3.44 nM, and high electroactive surface area of 0.0054 cm². Our projected electrode has successfully applied for the determination of thiamethoxam in spiked orange juice samples with acceptable recovery results varied from 98.7 % to 103.2 %. Hence, the sensor electrode offers a straightforward, budget-friendly, eco-conscious, portable, and economical solution for thiamethoxam detection.