Highly sensitive electrochemical stripping analysis of methyl parathion at MWCNTs–CeO2–Au nanocomposite modified electrode

A novel multi-walled carbon nanotubes–CeO2–Au nanocomposite (MWCNTs–CeO2–Au) was synthesized by a facile two-step precipitation method and used for solid-phase extraction of methyl parathion (MP). The MWCNTs–CeO2–Au nanocomposite combined the individual properties of MWCNTs (high conductivity and exceptional adsorption affinity) and nanoparticles (high surface area and special catalytic activity), and realized the efficient enrichment and electrochemical stripping voltammetric detection of MP. An ultra-low detection limit of 3.02 × 10−11 M for MP was obtained at MWCNTs–CeO2–Au nanocomposite modified electrode, suggesting the high sensitivity of the nanocomposite based electrochemical sensor. Moreover, the proposed electrochemical sensor was successfully employed for the determination of MP in water and soil samples.