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 to 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%
Author keywords: Environmental water, Gas chromatography, Molecularly imprinted polymers, phosphorothioate pesticides, solid phase dispersion