Abstract:

A method for the determination of flumioxazin residue in foods by gas chromatography-mass spectrometry (GC-MS) has been developed. The food sample was extracted with acetonitrile or ethyl acetate, concentrated in a rotary evaporator, then dissolved in acetonitrile-methyl benzene （3∶1, v/v） and purified with an NH2-solid phase extraction （SPE） column. The final extract was analyzed by gas chromatography-mass spectrometry with selected ion monitoring mode (GC-MS-SIM). External standard method was used for the quantification. The mean recoveries of flumioxazin spiked in foods were 79.4%-101%, and the relative standard deviations were 0.242%-7.15%(n=10). The detection limit for each was 0.01 mg/kg. This method has high sensitivity, veracity and is suitable for the determination of pesticide residues in foods.

Key words: flumioxazin, foods , gas chromatography-mass spectrometry (GC-MS), selected ion monitoring (SIM), solid phase extraction (SPE)