Sensitive Voltammetric Determination of Methyl Parathion Using a Carbon Paste Electrode Modified with Mesoporous Zirconia

摘要

A mesoporous zirconia modified carbon paste electrode was developed for electrochemical investigations of methyl parathion (MP, Phen-NO2). The significant increase of the peak currents and the improvement of the redox peak potential indicate that mesoporous zirconia facilitates the electronic transfer of MP. The oxidation peak current was proportional to the MP concentration in the range from 1.0108 to 1.0105 mol L1 with a detection limit of 4.6 109 mol L1 (S/N3) after accumulation under open-circuit for 210 s. The proposed method was successfully applied to the determination of MP in apple samples.