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Abstract: In this study, we designed and synthesized Fe3O4/reduced graphene oxide (Fe3O4/rGO) and MIL@MIP, which were characterized using transmission electron microscopy (TEM), X-ray diffraction, Fourier transform infrared (FT-IR), cyclic voltammetry (CV), and differential pulse voltammetry (DPV). Here, reports a novel biomimetic electrochemical sensor (BECS) sensitized with Fe3O4/reduced graphene oxide (Fe3O4/rGO) nanocomposite using MIL@MIP film as recognition element for ultrasensitive quantification of methamidophos or omethoate. The BECS offered fast responses for methamidophos and omethoate with wide linear response ranges of 1.0 x 10-7 - 1.0 x 10-12 and 1.0 x 10-7-1.0 x 10-13 mol/L, respectively. Under optimized conditions, the limit of detection (LOD; S/N = 3) of the BECS method was 2.67 x 10-13 mol/L for methamidophos and 2.05 x 10-14 mol/L for omethoate. The BECS was applied to detection of methamidophos and omethoate in spiked cucumber and kidney bean samples, and good recoveries varied from 88.2 to 96.9 %. This proposed method was adopted for the determination of the methamidophos or omethoate residues in the rape sample, and the results were also verified using the method of gas chromatography
Template and target information: methamidophos, omethate
Author keywords: Biomimetic electrochemical sensor, molecularly imprinted polymer, Ferriferrous oxide, Reduced graphene oxide, Metal organic framework