Photoelectrochemical Method for the Detection of Methyl Parathion Residues in Tomato
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Abstract:
Cd0.5Zn0.5S/G nanocomposite was successfully prepared by the in situ doping of graphene (G) with multi-metal sulfide (Cd0.5Zn0.5S). The composite was used to modify the surface of a glassy carbon electrode. Based on the principle of suppression of photoelectrochemical signals by organophosphate pesticides, using methyl parathion as a model molecule, a photoelectrochemical sensor was constructed. The Cd0.5Zn0.5S/G nanocomposites were characterized by scanning electron microscopy (SEM) and electron dispersion spectroscopy (EDS), meanwhile, their photoelectrochemical performance in a buffer solution was also investigated. The result showed that, because of the synergistic effect between Cd0.5Zn0.5S and G, the photoelectrochemical intensity of the Cd0.5Zn0.5S/G nanocomposites was significantly higher than that of pure Cd0.5Zn0.5S and G, thus increasing the sensitivity of the sensor. The constructed sensor was used to analyze methyl parathion solutions with different concentrations, and it exhibited a linear response to methyl parathion over a wide range, from 0.01 to 100 ng mL?1, with a detection limit of less than 5 pg mL?1. The sensor showed excellent reproducibility and stability, and provided an effective approach for the rapid detection of organophosphate pesticides.
