Near-criticalflukk and liquefied gases can achieve high eficiencies in the extraction of organic contaminants from soil. Adsorptive behavior of several polycyclic aronwtic hydrocarbons (PAHs) from supercritical carbon dioxide (SC COJ onto sandy bum-type soil has been characterized. Data for the solubility of phetuznthrene, anthracene, triphenylene, and perylene in SC C02 k n s t r a t e s a strong relationship between solubility and the carbon number and angularity of the ring structure. Soil adsorption isotherms for these compounds are non-linear, and haue been described using Freundich and BET adsorption models. The slope of the adsorption isotherms has been correlated with PAH solubility on log-log coordinates.Addition of polar modijiers, e.g., water or methanol, dramatically reduces the PAH adsorption levels, indicating the importance of polar adsorption sites on soil mfkces.
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