Abstract:

Five organophosphorus pesticide residues from peanut were determined by using solid-phase dispersion-assisted accelerated solvent extraction coupled with gas chromatography. The peanut samples were mixed with florisil and diatomite to fill the extraction instrument. Extraction was performed with acetone at 10.0 MPa and 80 ℃ for heating 5 min and static extraction 5 min. Elution was analyzed with GC-NPD detector. At the spiked sample levels of 0.05 mg/kg and 0.1 mg/kg, the recovery rates of organophosphorus pesticide residues were 88.2%－104.5% with a relative standard deviation less than 7.1% and the detection limit of 0.030－0.038 mg/kg. This method has excellent resolution, high sensitivity, good precision and wide linearity.

Key words: accelerated solvent extraction, organophosphorus pesticide, gas chromatography, matrix solid-phrase dispersion