Ecotoxicité d'un sol de cokerie contaminé par des hydrocarbures aromatiques polycycliques (HAP)

Abstract : A cokery soil polluted by PAHs was assessed for its toxicity and genotoxicity to soil and aquatic organisms. Total mean 16 PAH concentration was determined to 2634 241 mg/kg d.w. The heavy metals were in the range of the respective regional reference values. The effective concentration (EC) values based on concentration-response relationships were calculated. Toxicity of water extracts in chronic bioassays (algal growth and reproduction of C. dubia) was high compared to acute toxicity (bacterial luminescence and daphnid viability). The Ames and Mutatox tests indicated mutagenicity of water extracts, while no response was found with the Umu test showing lower sensitivity. Germination of the tested plant species was not affected, contrary to plant growth. Fresh biomass was a more sensitive parameter than dry biomass. The results of terrestrial toxicity showed that toxic effect of contaminated soil was high, when survival and reproduction of collembola, reproduction of earthworm and survival of juvenile earthworm were measured. Different concentrations of the contaminated soil mixed with the artificial ISO or loamy natural soil were tested to determine influence of the control soil on toxicity. There was a significant trend that toxicity of contaminated soil was lower in the natural soil tested than in ISO, when reproduction of collembola and earthworm was studied. The transfer of PAHs from contaminated soil to biota (earthworm and plant) was inferior to 1, indicating no major problem in trophic chains. The earthworm bioaccumulation of high- molecular-weight PAHs with 5-6 aromatic rings was higher than the one of low-molecular-weight PAHs with 3-4 aromatic rings.
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Ig-Chum Eom. Ecotoxicité d'un sol de cokerie contaminé par des hydrocarbures aromatiques polycycliques (HAP). Sciences agricoles. Université Paul Verlaine - Metz, 2006. Français. ⟨NNT : 2006METZ008S⟩. ⟨tel-01752467⟩

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