Abstract: A method for the simultaneous determination of 28 organochlorine and synthetic pyrethroid pesticides in greasy wool was developed by accelerated solvent extraction (ASE) coupled with gas chromatography-electron capture detection (GC-ECD). The organochlorine and synthetic pyrethroid pesticides in greasy wool were extracted with acetonitrile saturated with n-hexane at 80 ℃, 10.34 MPa by ASE. The extract was pretreated by a series of procedures such as freezing-lipid filtration, concentration and purification by solid-phase extraction prior to the determination with GC-ECD. The linear ranges were 0.005-1.0 mg/L for 16 organochlorines, 0.02-4.0 mg/L for flumethrin and 0.01-2.0 mg/L for the others. There were good linear relationships between the peak area and concentration in the linear ranges. The average recoveries of 28 organochlorine and synthetic pyrethroid pesticides were 67.2%-107.7%, and the relative standard deviations were 2.6%-29.0%. The method is simple, sensitive and suitable for preliminary screening of organochlorine and synthetic pyrethroid pesticides in greasy wool.

Key words: gas chromatography-electron capture detection (GC-ECD), gas chromatography-mass spectrometry (GC-MS), greasy wool , organochlorine pesticides (OCs), synthetic pyrethroid pesticides (SPs), accelerated solvent extraction (ASE)