Optimization of microwave assisted solvent extraction of polychlorinated biphenyls from marine sediments

A simple and rapid procedure to extract polychlorinated biphenyls (PCBs) fr om marine sediments by means of microwave energy is proposed. Both spiked a nd real sediment samples were irradiated with microwaves in a closed-vessel system while immersed in hexane-acetone (1:1). Factorial design was applie d to optimize the microwave assisted solvent extraction process by using a spiked sediment. Four variables (extraction time and temperature, solvent v olume and moisture percentage in the sediment) were considered in the optim ization process. The results show that all compounds behave in the same way and that only the solvent volume is statistically significant. Recoveries of PCBs were around 100% with 2 to 11% relative standard deviation. Validat ion of the extraction process was carried out by processing a certified ref erence material. (C) 1999 John Wiley & Sons, Inc.