Abstract
A method to determine 21 organochlorine pesticides (OCPs) in tree leaves [chestnut ( Castanea sativa), hazel ( Corylus avellana), oak ( Quercus robur) and walnut tree ( Juglans regia)] based on microwave-assisted extraction (MAE) followed by solid-phase extraction (SPE) clean-up is described. After extraction with hexane:acetone (50:50), four different sorbents (Florisil ®, tandem Florisil ® + alumina, silica and ENVI™-Carb) were assayed 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). Carbon was the sorbent, which provided colourless eluates and chromatograms with less interferent compounds. Analytical recoveries obtained were ca. 100% for all the studied pesticides with this sorbent.
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