期刊
JOURNAL OF CHROMATOGRAPHY A
卷 921, 期 2, 页码 297-304出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(01)00874-3
关键词
olive oil; food analysis; endosulfan; pyrethroids; pesticides
A simple, fast and economical method has been developed for the determination of endosulfan and five pyrethroid insecticides, cypermethrin, deltamethrin, fenvalerate, lambda -cyhalothrin and permethrin, in virgin olive oil. The method uses a Sep-Pak alumina-N column cleanup after a liquid-liquid extraction or low-temperature precipitation step, and gas chromatography (GC) with electron-capture detection. The matrix effect was assessed for the GC systems used. Recoveries were 71-91% with RSD values of 6-17%. The method was applied to 338 virgin olive oil samples for monitoring of residues of these pesticides. Cypermethrin and lambda -cyhalothrin were detected at the limit of quantification in one sample each, while 22% of samples contained endosulfan residues, mostly at very low levels ranging from 0.02 to 0.57 mg/kg. (C) 2001 Elsevier Science B.V. All rights reserved.
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