“…The most frequently used methods for the extraction of organic compounds from soils are Soxhlet or ultrasonic extraction. The newer extraction techniques, such as supercritical fluid extraction (SFE) (Van der Velde et al, 1992;Snyder et al, 1993;Ling and Liao, 1996), pressurized liquid extraction (PLE) (Mogadati et al, 1999) and microwave-assisted extraction (MAE), are very attractive because they are faster, use much smaller amounts of solvents and are environmentally friendly techniques. SFE uses a solvent in its supercritical state.…”