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.
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Acknowledgments
We thank the GISFI (French Scientific Interest Group-Industrial Wasteland (http://www.gisfi.prd.fr). We are also grateful to Angelina Razafitianamaharavo for the specific area determination of the bentonite. We thank Dr. Pranay Morajkar for proofreading and language correction.
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Biache, C., Kouadio, O., Lorgeoux, C. et al. Impact of clay mineral on air oxidation of PAH-contaminated soils. Environ Sci Pollut Res 21, 11017–11026 (2014). https://doi.org/10.1007/s11356-014-2966-9
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DOI: https://doi.org/10.1007/s11356-014-2966-9