Subsamples of 5 g of air-dried soil and 3g of wet plant tissues were homogenized with sodium sulfate and spiked with 20 ng of PCB #103 as a surrogate standard; these were Soxhlet extracted (8 h) with a mixture of hexaneedichloromethane (50:50), then concentrated using a vacuum pump, and finally concentrated to 2-mL volume under nitrogen flow.