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Abstract
Extraction efficiencies of polycyclic aromatic compounds (PAHs) from spruce needles (Picea abies) obtained by recently introduced “focused microwave assisted (FMW) extraction” (i) and conventional methods represented by extraction enhanced by sonication (ii) and Soxhlet extraction (iii) were compared. n-Hexane:acetone (azeotropic ratio, 53.5 wt % of acetone) extraction mixture was used in all experiments. The influence of various parameters (extraction time, intensity of irradiation, moisture content) both on the recoveries of PAHs from spruce needles (Picea abies) and the amount of co-isolated matrix components potentially interfering within the determinative step was examined. The mean extraction efficiencies of PAHs obtained by FMW extraction and sonication were found to be lower (82 % and 75 %, respectively) compared the extraction in Soxhlet apparatus (equal 100 %).