title: Impact of clay mineral on air oxidation of PAH-contaminated soils.
abstract: This work investigated the impact of a clay mineral (bentonite) on the air oxidation of the solvent extractable organic matters (EOMs) and the PAHs from contaminated soils. EOMs were isolated from two coking plant soils and mixed with silica sand or bentonite. These samples, as well as raw soils and bentonite/soil mixtures, were oxidized in air at 60 and 100 °C for 160 days. Mineralization was followed by measuring the CO2 produced over the experiments. EOM, polycyclic aromatic compound (PAC), including PAH, contents were also determined. Oxidation led to a decrease in EOM contents and PAH concentrations, these diminutions were enhanced by the presence of bentonite. Transfer of carbon from EOM to insoluble organic matter pointed out a condensation phenomenon leading to a stabilization of the contamination. Higher mineralization rates, observed during the oxidation of the soil/bentonite mixtures, seem to indicate that this clay mineral had a positive influence on the transformation of PAC into CO2.
authors.affiliation: Université de Lorraine, LIEC, UMR7360, Vandœuvre-lès-Nancy, Cedex, 54506, France, coralie.biache@yahoo.fr.
authors.forename: Coralie
authors.initials: C
authors.lastname: Biache
authors.forename: Olivier
authors.initials: O
authors.lastname: Kouadio
authors.forename: Catherine
authors.initials: C
authors.lastname: Lorgeoux
authors.forename: Pierre
authors.initials: P
authors.lastname: Faure
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001546:Bentonite / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry; D000077215:Clay; D003032:Coal Mining; D004787:Environmental Pollution; D010084:Oxidation-Reduction; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry* / Q000302:isolation & purification; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D000538:Aluminum Silicates; D011084:Polycyclic Aromatic Hydrocarbons; D012987:Soil; D012989:Soil Pollutants; D001546:Bentonite; D002245:Carbon Dioxide; D000077215:Clay