Facile one-step electrodeposition preparation of poly(L-Ornithine) film modified glassy carbon electrodes for sensitive detection of Thiamethoxam

Abstract

In this work, a green, low-cost and environmental-friendly voltammetric sensor, poly(L-Ornithine) film modified glassy carbon electrode was fabricated for the first time and used for determination of pesticide thiamethoxam. The modified electrode was characterized by cyclic voltammetry and electrochemical impedance spectroscopy. The redox character of thiamethoxam at proposed sensor was studied systematically. Utilizing the linear sweep voltammetry, a wider linear range (5.0×10-8 mol L-1 - 9.0×10-6 mol L-1) and lower detection limit (1.7×10-8 mol L-1) (S/N=3) for the detection of thiamethoxam were achieved. In addition, the proposed method was successfully applied to the determination of thiamethoxam in the real sample with satisfactory results.