Determination of atrazine in vegetables by magnetic molecularly imprinted polymer flow injection preconcentration and gas chromatography

OBJECTIVE: A method for rapid determination of atrazine in vegetables by gas chromatography based on magnetic molecular imprinting technology in flow injection system was established. METHODS: Core-shell magnetic molecularly imprinted polymers were prepared using ferroferric oxide modified with chitosan as the carrier, atrazine as the template, methacrylic acid as the functional monomer, and ethylene glycol dimethacrylate as the cross-linker. The attraction of the imprinted polymers for atrazine was studied through static equilibrium binding. The atrazine in the sample were extracted with ethyl acetate and then cleaned-up with MIPs SPE cartridges. The target molecules were eluted by methanol and then quantitatively determined by gas chromatograph. RESULTS: The maximum adsorption capacity was 52. 0 mg/g. Under the optimal conditions, the linearity of the method obtained was 5-100 μg/L. The detection limits of atrazine was 0. 6 μg/kg. The recoveries were between 81. 5% and 107. 7%(n=6). CONCLUSION: The proposed method is successfully applied to determine atrazine in vegetables.