The synthesis and optimization of an electrochemical sensor based on gold nanoparticles (AuNPs)/ conducting poly Congo red dye (poly(CR)) nanocomposite is reported for the detection of the Oxazolidinone fungicide famoxadone (FAM), an environmentally hazardous material. The modification of a glassy carbon electrode (GCE) was performed using cyclic voltammetry (CV) to deposit poly(CR) while AuNPs were deposited using chronoamperometry. Two linear ranges 0.001 – 1 µM (0.37 – 374.40) µg/L and 3 – 100 µM (1.12 – 37.44) mg/L were recorded using AuNPs/poly (Congo Red)/GCE sensor for FAM with limit of detection (LOD) of 0.17 nM (0.06 µg/L) and limit of quantification (LOQ) of 0.48 nM (0.18 µg/L). The tested sensor showed good stability, reproducibility, and repeatability. in addition, sufficient selectivity towards FAM in the presence of other tested pesticides was shown. Finally, the fabricated sensor was applied for the determination of FAM in vegetables and commercial fungicides formulation, with a recovery range 98.9 - 105.4% and RSD 0.70– 4.46%, which represents its efficiency in comparison with previously reported chromatographic methods.
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