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MP5 Novel Methods for Bioaccumulation Assessment
() Development of a preliminary food-web biomagnification model using a generic scheme.
Gonzalez-Doncel, M.1, Alonso, E.1, Ortiz, J.1, Martin de Madariaga, B.1, Tarazona, J.V.1, 1 INIA, Madrid, Madrid, Spain
ABSTRACT- The capacity of some chemicals to accumulate in the biota and to magnify through the food-chain is recognized as a crucial element in the environmental risk assessment. These processes are being considered in regulatory proposals albeit they are not supported by a strong scientific basis. Though there are several bioaccumulation models in the scientific literature, there is a need to develop new methodologies that should improve the predictive capacity of the bioaccumulation and biomagnification models used for regulatory decisions in the Ecological Risk Assessment (ERA) arena (these decisions are classically based on the chemical's lipophilicity) developing a tool allowing the classification of substances following their bioaccumulation/biomagnification potential. In this work we propose a biomagnification model that relies on a succession of bioaccumulation processes each one regulated by toxicokinetic parameters. Several kinetic models have been developed for taxonomic groups belonging to different trophic levels and having different ecological behavior. A preliminary establishment of a generic biomagnification model by the integration and assembly of these kinetic models together with other inputs such as natural exposure conditions (temporal and spatial chemical variability) will be presented. This model could be integrate in the actual protocols for categorizing Persistent Bioaccumulating Toxic Substances (PBTs). This work has been supported by the CEFIC LRI initiative Project ECO1A-INIA-1100.
Key words: Biomagnification, Bioaccumulation, Models, PBTs
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