Analysis of endosulfan isomers and endosulfan sulfate in air and tomato leaves by gas chromatography with electron-capture detection and confirmation by gas chromatography-mass spectrometry

Rapid analytical methods for the determination of endosulfan isomers and endosulfan-sulfate in air and plant samples were developed. The insecticides were trapped from air using a column containing Florisil and extracted with a low volume of ethyl acetate, assisted by sonication. Pesticide residues were determined by gas chromatography with electron-capture detection using a nonpolar capillary column. Residue identities were confirmed by gas chromatography coupled with mass spectrometry. Recoveries of these compounds from air samples were always higher than 78% with an RSD lower than 11% and the detection limits obtained were at least 0.3 ng/l air. Leaf samples were homogenised with ethyl acetate and extracts cleaned-up on an aluminium oxide column. Pesticides were eluted with a hexane-ethyl acetate (8020, v/v) mixture. Recoveries obtained from plant samples were higher than 78% with an RSD lower than 14% and detection limits in leaves were 0.02 μg/g for each pesticide. These methods were applied to study the volatilisation of endosulfan from tomato leaves under laboratory conditions. A volatilisation rate near 1% of the initial amount of endosulfan per hour was obtained during the first 24 h at room temperature. © 2002 Elsevier Science B.V. All rights reserved.

Bibliographic Details

Main Authors:	Castro, J., Pérez Martín, Rosa Ana, Miguel Gómez, María Esther, Sánchez-Brunete, C., Tadeo Lluch, José Luis
Format:	artículo biblioteca
Language:	English
Published:	Elsevier 2002
Subjects:	Air analysis, Plant materials, Vegetables, Endosulfan, Pesticides,
Online Access:	http://hdl.handle.net/20.500.12792/5809 http://hdl.handle.net/10261/292498
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