Citation: WU Jia-Wen, XIE Zhou-Jian, TAN Xue-Cai, HU Qi, LEI Fu-Hou. Electrochemical Sensor Based on Molecularly Imprinted Polymer and Graphene Modified Electrode for Determination of Methyl Parathion[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(6): 757-764. doi: 10.19756/j.issn.0253-3820.191589 shu

Electrochemical Sensor Based on Molecularly Imprinted Polymer and Graphene Modified Electrode for Determination of Methyl Parathion

School of Chemistry and Chemical and Engineering, Guangxi University for Nationalities, Key Laboratory of Guangxi Colleges and Universities for Food Safety and Pharmaceutical Analytical Chemistry, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Zhuang Autonomous Region Institute of Product Quality Inspection, Nanning 530006, China

Received Date: 9 October 2019
Revised Date: 5 April 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21365004), the Key Research and Development Plan of Guangxi (No. AB18126048), the Major Science and Technology Projects in Guangxi (No.AA18118013-10), the Project of Basic Ability Improvement of Young and Middle-aged Teachers of Universities in Guangxi (No. 2017KY0164), and the Youth Fund Poject of Guangxi University for Nationalities (No. 2018MDQN004).

A molecularly imprinted electrochemical sensor based on graphene modified electrode was fabricated for determination of methyl parathion(MP). The molecularly imprinted polymer membrane was synthesized on the surface of graphene-modified glassy carbon electrode by using MP as template, methacrylic acid as functional monomer and ethylene glycol maleic rosinate acrylate as cross linker. The electrochemical properties of the sensor were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). Under optimal conditions, the peak current of the sensor showed a good linear correlation with the MP concentration in the range of 1.0×10^-7-8.0×10^-5 mol/L, with a detection limit of 5.0×10^-8 mol/L (S/N=3). The linear regression equation was I_p (μA)=-0.65199-0.02387C (μmol/L), with a correlation coefficient (R²) of 0.9922. The adsorption model of the imprinted sensor was investigated, and the binding rate constant k was 20.2758 s. The sensor was successfully applied to determination of MP in tomato samples with recoveries of 95.0% to 100.3%.
- Methyl Parathion,
- Graphene,
- Molecularly imprinted electrochemical sensor,
- Malay rosin ethylene glycol acrylate
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