Supercritical fluid extraction of aromatic contaminants from a sandy loam soil

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Environmental Progress; (USA)

DOI:https://doi.org/10.1002/ep.670090413· OSTI ID:5479323

Andrews, A T; Ahlert, R C; Kosson, D S ^[1]

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1. Rutgers, The State Univ. of New Jersey, Piscataway (USA)

Near-critical fluids and liquefied gases can achieve high efficiencies in the extraction of organic contaminants from soil. Adsorptive behavior of several polycyclic aromatic hydrocarbons (PAHs) from supercritical carbon dioxide (SC CO{sub 2}) onto sandy loam-type soil has been characterized. Data for the solubility of phenanthrene, anthracene, triphenylene, and perylene in SC CO{sub 2} demonstrates 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 have been described using Freundlich and BET adsorption models. The slope of the adsorption isotherms has been correlated with PAH solubility on log-log coordinates. Addition of polar modifiers, e.g., water or methanol, dramatically reduces the PAH adsorption levels, indicating the importance of polar adsorption sites on soil surfaces.

• OSTI ID: 5479323
• Journal Information: Environmental Progress; (USA), Journal Name: Environmental Progress; (USA) Vol. 9:4; ISSN ENVPD; ISSN 0278-4491
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
ADSORPTION
ADSORPTION ISOTHERMS
AROMATICS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CLEANING
DECONTAMINATION
HAZARDOUS MATERIALS
ISOTHERMS
KINETICS
LOAM
MATERIALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLAR COMPOUNDS
REACTION KINETICS
SOILS
SOLUBILITY
SORPTION