Abstract
A method to determine 21 organochlorine pesticides in horticultural samples (lettuce, pepper, tomato, spinach and potato) based on microwave assisted extraction (MAE) followed by solid-phase extraction (SPE) clean-up is described. After extraction with hexane : acetone (50 : 50), a carbon cartridge was employed for the clean-up step. Pesticides were eluted with 5 mL of hexane : ethyl acetate (80 : 20) and determined by gas chromatography and electron capture detection (GC-ECD). Results were confirmed by GC-MS analysis. Analytical recoveries obtained were ca. 100% for most of the studied pesticides with the proposed method in each analysed matrix. The method was applied to analyse 35 commercial samples from A Coruña (NW Spain); only two samples contained pesticide residues, but none of them exceeded the MRLs established by EU legislation.
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