Effect of pre-heating on the chemical oxidation efficiency: Implications for the PAH availability measurement in contaminated soils

Coralie Biache (1) , Catherine Lorgeoux (2) , Sitraka Andriatsihoarana (1, 2, 3) , Stéfan Colombano (3) , Pierre Faure (1)

1 LIEC - Laboratoire Interdisciplinaire des Environnements Continentaux
2 GeoRessources
3 BRGM - Bureau de Recherches Géologiques et Minières (BRGM)

Three chemical oxidation treatments (KMnO4, H2O2 and Fenton-like) were applied on three PAH-contaminated soils presenting different properties to determine the potential use of these treatments to evaluate the available PAH fraction. In order to increase the available fraction, a pre-heating (100 degrees C under N-2 for one week) was also applied on the samples prior oxidant addition. PAH and extractable organic matter contents were determined before and after treatment applications. KMnO4 was efficient to degrade PAHs in all the soil samples and the pre-heating slightly improved its efficiency. H2O2 and Fenton-like treatments presented low efficiency to degrade PAH in the soil presenting poor PAH availability, however, the PAH degradation rates were improved with the pre-heating. Consequently H2O2-based treatments (including Fenton-like) are highly sensitive to contaminant availability and seem to be valid methods to estimate the available PAH fraction in contaminated soils.

Mots clés: Hydrogen peroxide; Potassium permanganate; Fenton-like; Polycyclic aromatic hydrocarbon; Contaminant availability; Potassium permanganate; Fenton-like; Polycyclic aromatic hydrocarbon; Contaminant availability

Domaines: Interfaces continentales, environnement; Sciences de l'environnement

Coralie Biache, Catherine Lorgeoux, Sitraka Andriatsihoarana, Stéfan Colombano, Pierre Faure. Effect of pre-heating on the chemical oxidation efficiency: Implications for the PAH availability measurement in contaminated soils. Journal of Hazardous Materials, 2015, 286, pp.55-63. ⟨10.1016/j.jhazmat.2014.12.041⟩. ⟨hal-01159492⟩