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Abstract: Graphene and a novel cross-linker (ethylene glycol maleic rosinate acrylate) were used to prepare molecularly imprinted electrochemical sensors with high sensitivity. A molecular imprinting polymer (MIP) film was created on a graphene-modified glassy-carbon electrode for determination of chlorpyrifos (CPF) using free radical polymerization method. The electrochemical properties of the MIP and non. imprinted polymer (NIP) sensors were investigated via cyclic voltammetry (CV), linear sweep voltammetry, and electrochemical impedance spectroscopy (EIS). The surface morphology of the imprinted film was characterized by scanning electron microscopy (SEM). Under the optimal experimental conditions, the peak currents were proportional to the concentrations of chlorpyrifos in the range of 2. 0x10(-7)-1. 0x10(-5) mol/L with a detection limit of 6. 7x10(-8) mol/L (S /N = 3). The linear equation was I-p(mu A)= -7. 1834-0. 2424C (mu mol/L) (R-2 = 0. 9959). Adsorption model of the molecular imprinted sensor was investigated, and the measured imprinting factor. of the sensor was 2. 59, with the binding rate constant k of 12. 2324 s. The developed electrochemical sensor based on graphene modified electrode and molecularly imprinted polymer exhibited good repeatability and stability, and was successfully used to determine CPF in water and vegetable samples with recoveries from 94. 1% to 101. 1%
Template and target information: chlorpyrifos
Author keywords: Chlorpyrifos, Graphene, molecularly imprinted polymer, Electrochemical sensor, ethylene glycol maleic rosinate acrylate