The reusability of Fe3O4@SiO2@C18 magnetic sorbents for the extraction of target analytes was also investigated. The magnetic sorbent was regenerated by washing twice with acetone, after each adsorptionelution cycle. In such way, no carry-over of the analytes on the adsorbent was detected. The recoveries of OCPs and PCBsand hence the extraction capacity of the remained constant after three successive cycles, indicating good stability and reusability.After three cycles a graduate loss of the extraction efficiency was observed for all target analytes.