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Article Dans Une Revue Environmental Pollution Année : 2013

Protective role of fine silts for PAH in a former industrial soil

Résumé

An original combined organic geochemistry and soil science approach was used to elucidate PAH availability controlling factors in a multi-contaminated industrial soil. Water granulodensimetric fractionation was applied to obtain five water-stable material fractions. These were characterized by elemental, molecular and mineral analysis, and microscopic observations. Among the different fractions, fine silts distinguished themselves by higher carbon and nitrogen contents, lower C/N ratio, an enrichment in total PAH and especially high molecular weight compounds, a coal tar signature and the lowest PAH availability. This fine silt fraction seemed to play a protective role for PAH that might be explained by its size and/or its specific reactivity. The mineral phases present in this fraction were proposed to explain the protection of organic matter. This led to a specific molecular signature of OM, having higher sorption properties both processes (sorption and mineral-bound protection) resulting in a lower PAH availability. (C) 2013 Elsevier Ltd. All rights reserved.

Dates et versions

hal-01119519 , version 1 (23-02-2015)

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Audrey Pernot, Stéphanie Ouvrard, Pierre Leglize, Pierre Faure. Protective role of fine silts for PAH in a former industrial soil. Environmental Pollution, 2013, 179, pp.81-87. ⟨10.1016/j.envpol.2013.03.068⟩. ⟨hal-01119519⟩
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