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Titre :
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Bioaccumulation of polycyclic aromatic hydrocarbons by earthworms: Assessment of equilibrium partitioning theory in in situ studies and water experiments
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Auteurs :
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W. Ma ;
A. Van Kleunen ;
J. Immerzeel ;
G. De Maagd
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Type de document :
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article/chapitre/communication
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Année de publication :
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1998
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Format :
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p. 1730-1737
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Langues:
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= Anglais
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Catégories :
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CHIMIE
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Mots-clés:
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DERIVE AROMATIQUE
;
POLLUTION DU SOL
;
PLAINE D'INONDATION
;
LOMBRIC
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Résumé :
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The purpose of this study was to assess the suitability of applying equilibrium partitioning (EqP) theory to predict the bioaccumulation of polycyclic aromatic hydrocarbons (PAHs) by earthworms when these are exposed to contaminated soils in the field. Studies carried out in situ in various contaminated floodplain sites showed the presence of linear relationships with intercept zero between the lipid-normalized concentration of different PAHs in the earthworm Lumbricus rubellus and the organic-matter-normalized concentration of the compounds in soil. The demonstration of such an isometric relationship is in agreement with the prediction of EqP theory that the biota-soil accumulation factor (BSAF) should be independent of the octanol/water partition coefficient, log K-ow. The average BSAF of PAH compounds in the sampled 20-cm top layer of soil was 0.10 (range. 0.03-0.26). The present study also investigated the route of uptake of PAWs for earthworms in soil. The bioconcentration factor of low-molecular-weight PAHs, such as phenanthrene, fluoranthene, and pyrene, was derived from bioconcentration kinetic modeling of water-only experiments and found to be of the same order of magnitude as the bioaccumulation factor in the field when the latter was normalized to calculated concentrations in soil pore water.
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Source :
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Environmental Toxicology and Chemistry, vol.17, n°9
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