Abstract
In the present study an evaluation was made of a method for the determination of organochlorine pesticide residues in ethoxylated lanolin. Samples were homogenized with Celite, transferred to chromatographic columns, prepacked with silica gel deactivated to 10%. The pesticide elution was processed with n-hexane–dichloromethane and the concentrated eluate was analyzed using gas–liquid chromatography (GC) with electron capture detection (ECD). The composition of the elution solvent was a significant factor for the recovery of the pesticides. Mean recoveries obtained for fortified samples ranged from 87 to 94% for p, p′-DDE, dieldrin, endrin, p, p′-DDD and p, p′-DDT. Optimization of the experimental conditions resulted in a small-scale method that combines extraction and cleanup in a single step.
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