Abstract
The applicability of pressurised solvent extraction (PSE) for the quantitative extraction of different classes of semi- volatiles, including polycyclic aromatic hydrocarbons (PAHs), phenols, polychlorinated biphenyls (PCBs) and total petroleum hydrocarbons have been evaluated. For this study a conventional supercritical fluid extraction (SFE) system, the Suprex SFE/50 was adapted to function as a pressurised solvent extraction system. Solid samples were weighed into the SFE thimble and extract ed using conventional extraction solvents instead of supercritical carbon dioxide. Parameters such as extraction temperature and e ffect of modifiers were investigated. Although limited by the 150 oC maximum oven temperature, it was found effective extraction could still be carried out in less than 25 min for all the compounds studied. The technique was applied to different real matri - ces contaminated with hydrocarbons, PAHs and phenols. Validations of the technique were performed using standard reference materials. Recoveries for these matrices were good (> 75%) and precision was generally less than a 10% RSD. Extensive com- parison of this technique with sonication and with microwave assisted extraction (MAE) were made, and recoveries were found to be comparable to MAE and superior to sonication.
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