Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 968, Issue 1-2, Pages 201-209Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(02)00846-4
Keywords
matrix solid-phase dispersion; extraction methods; food analysis; fruits; vegetables; pesticides
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A method based on matrix solid-phase dispersion (MSPD) and gas chromatography to determine eight fungicides in fruits and vegetables is described. Fungicide residues were identified and quantified using nitrogen-phosphorus detection and electron-capture detection connected in parallel and confirmed by mass spectrometric detection. The method required 0.5 g of sample, C, bonded silica as dispersant sorbent, silica as clean-up sorbent and ethyl acetate as eluting solvent. Recoveries from spiked orange, apple, tomato, artichoke, carrot and courgette samples ranged from 62 to 102% and relative standard deviations were less than 15% in the concentration range 0.05-10 mg kg(-1). Detection and quantitation limits ranged 3-30 mug kg(-1) and 10-100 mug kg(-1), respectively, with linear calibration curves up to 10 mg kg(-1). The analytical characteristics of MSPD compared very favourably with the results of a classical multiresidue method, which uses ethyl acetate and anhydrous sodium sulphate for the extraction. (C) 2002 Elsevier Science B.V. All rights reserved.
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