Comparison of supercritical chlorodifluoromethane, nitrous oxide, and carbon dioxide for the extraction of polychlorinated biphenyls and polycyclic aromatic hydrocarbons
1992
Supercritical fluid extraction (SFE) recoveries for native pollutants including PCBs from a standard reference material sediment (SRM 1939), PAHs from a petroleum waste sludge, and PAHs from railroad bed soil were compared using supercritical CHCIF 2 (Freon-22), N 2 O, and CO 2 . While SFE with pure CO 2 yielded the lowest recoveries for each sample, CHCIF 2 consistently yielded the highest extraction efficiencies, most likely because of its high dipole moment
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