“…This preparation step should be followed by an analytical method which is sufficiently sensitive and selective to quantify compounds in trace amounts [36,37]. Common extraction procedures of pollutants in solid matrix include Pressurized Liquid Extraction (PLE) [19,23,26], Microwave Assisted Extraction (MAE) [21,24,30], sonication [18,27,28], Soxhlet [22] and solid liquid extraction [29]. The two latter sample extraction techniques were used almost exclusively in the 1980s and 1990s, but they are labour-intensive, time-consuming and require large volumes of solvent.…”