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Abstract: Molecularly imprinted matrix solid-phase dispersion coupled with gas chromatography (GC) is reported for the separation of tolclofos-methyl, phoxim, chlorpyrifos, and parathion-methyl from environmental waters. Molecularly imprinted polymer microspheres were synthesized using the structural analog tolclofos-methyl as a dummy template via surface grafting polymerization on nanosilica. The pesticides were extracted using the molecularly imprinted polymers and determined by gas chromatography using a nitrogen phosphorus detector. The results indicate that the interferences from the sample matrix were eliminated. The calibration graphs for the analytes were linear from 0.01-4.0 μg L-1. The limits of the detection for the pesticides were between 0.8 and 2.7 ng L-1 in environmental water. The recoveries at two fortification levels were between 83.2 and 105.4% with relative standard deviations less than 8.3%
Template and target information: dummy template, tolclofos-methyl, phoxim, chlorpyrifos, parathion-methyl
Author keywords: environmental water, gas chromatography, Molecularly imprinted polymers, phosphorothioate pesticides, solid-phase dispersion