ABSTRACT
A rapid detection method of 16 preservative residues in vegetables for export was developed by gas chromatography_mass spectrometry ( GC_MS ) after pre_treatment method of dispersive solid phase extraction ( SPE) . Samples including leafy, eggplant fruit, bean, melon and tuber vegetables were extracted with acetonitrile and detected by GC/MS with external standard method after being cleaned up with dispersive SPE. The results showed that the method had a good linearity over concentration range of 0 . 02-2 . 0 mg/L preservatives with correlation coefficients of 0 . 9990-0 . 9997 . The limits of detection ( LODs ) were in the range of 0. 004-0. 965 μg/kg. The recoveries of the preservatives were in the range of 76. 7%-120. 0% at the spiked levels of 0. 01, 0. 02 and 1. 00 mg/kg, and the relative standard deviations ( RSDs) were in the range of 2. 1%-10. 6%. Compared with the GB/T 19648_2006, etc, the method is rapid, simple, highly sensitive, and can meet testing requirements of 16 preservative residues in vegetables for export.