Organophosphate Pesticides Sensor using Copper Oxide Nanorods Modified on Screen-Printed Carbon Electrodes

Non-enzymatic electrochemical sensor is a promising platform for pesticide residue analysis due to its high performance, low cost, and fast analysis. This work synthesized copper oxide nanorods on a screen-printed carbon electrode through an anodization process. The modified electrodes were used to analyze organophosphate pesticides (i.e. chlorpyrifos and parathion) by cyclic voltammetry. The copper oxide modified electrode has achieved the average peak current of $\mathbf{60}.\mathbf{3} \boldsymbol{\mu} \mathbf{A}$ from cyclic voltammetry with 6.75% RSD. In addition, the calibration plot of chlorpyrifos and parathion were well fitted with log-linear $(\mathbf{R}^{\mathbf{2}}=\mathbf{0}.\mathbf{98})$ and power $(\mathbf{R}^{\mathbf{2}}=\mathbf{0}.\mathbf{94})$ regression model with a corresponding LOD of $\mathbf{3}.\mathbf{41}\ \boldsymbol{\boldsymbol{\mu}} \mathbf{M}$ and $\mathbf{6}.\mathbf{83}\ \boldsymbol{\mu}\mathbf{M}$ , respectively.