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Multiresidue determination in soil of pesticides used in tomato crops by sonication-assisted extraction in small columns and gas chromatography

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Various herbicides and insecticides belonging to different chemical groups and used in tomato crops were determined in soil. The proposed analytical method was based on the sonication-assisted extraction in small columns (SAESC) of pesticides using ethyl acetate. All pesticides were determined by capillary gas chromatography with electron-capture detection (GC-ECD) and their identity was confirmed by gas chromatography coupled with mass spectrometry (GC-MS). Recoveries obtained for all compounds in the two soils studied varied from 81 to 106% with a relative standard deviation between 2 and 9%. The limit of detection in the conditions assayed was at least 0.01 µg/g for all compounds. The developed procedure was applied to the analysis of real samples, obtained after tomato harvest, from 18 commercial fields in Spain, and residue levels of pendimethalin (0.018-0.650 µg/g) endosulfan-I (0.011-0.032 µg/g), endosulfan-II (0.014-0.178 µg/g) and endosulfan-sulfate (0.010-0.135 µg/g) were found.
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Keywords: Environmental analysis; Pesticides; SAESC extraction; Soil; Tomato

Document Type: Research Article

Publication date: January 1, 2003

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