Soil material contaminated with hydrocarbons can be cleaned by supercritical water extraction. Due to the high critical data of supercritical water (Tc = 647 K, P c = 22.1 MPa), supercritical carbon dioxide (T c = 304 K, P c = 7.3 MPa) was investigated as an alternative solvent. The amount of hydrocarbons removed from weathered contaminated soil material with supercritical carbon dioxide was less than 21%.
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Firus et al. (1997) studied this question.
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