VXC-72R/ZrO₂/GCE-Based Electrochemical Sensor for the High-Sensitivity Detection of Methyl Parathion

In this work, a carbon black (VXC-72R)/zirconia (ZrO₂) nanocomposite-modified glassy carbon electrode (GCE) was designed, and a VXC-72R/ZrO₂/GCE-based electrochemical sensor was successfully fabricated for the high-sensitivity detection of methyl parathion (MP). Electrochemical measurements showed that the VXC-72R/ZrO₂/GCE-based electrochemical sensor could make full use of the respective advantages of the VXC-72R and ZrO₂ nanoparticles to enhance the MP determination performance. The VXC-72R nanoparticles had high electrical conductivity and a large surface area, and the ZrO₂ nanoparticles possessed a strong affinity to phosphorus groups, which could achieve good organophosphorus adsorption. On the basis of the synergistic effect generated from the interaction between the VXC-72R and ZrO₂ nanoparticles, the VXC-72R/ZrO₂/GCE-based electrochemical sensor could show excellent trace analysis determination performance. The low detection limit could reach up to 0.053 μM, and there was a linear concentration range of 1 μM to 100 μM. Such a high performance indicates that the VXC-72R/ZrO₂/GCE-based electrochemical sensor has potential in numerous foreground applications.