Abstract
Abstract A model mixture (containing α-linolenic acid as interfering substance) for polychlorinated biphenyls (PCBs) and organochlorine pesticides determination was subjected to clean-up with various solid-phase extraction (SPE) columns. Octadecylsilyl (C-18), graphitised non-porous carbon (Envi-Carb), aminopropyl (NH 2 ), Florisil and Alumina SPE sorbents were evaluated. The relative sample clean-up provided by these SPE columns was evaluated using gas chromatography with electron capture detection (GC–ECD). The Florisil, Alumina and NH 2 columns were found to provide the most effective clean-up, removing the greatest amount of interfering substance, and simultaneously ensuring analyte recoveries higher than 70% for most compounds. The Envi-Carb and C-18 columns did little to eliminate matrix interferences. The developed clean-up procedure has been applied to real low-fat food samples, such as herring ( Clupea harengus ). Recoveries >78% with standard deviations (SD)
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