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(143) Model validation for risk assessment of bioaccumulation and biomagnification of chemicals through aquatic and terrestrial food-chains. Vega, M.M.1, Pablos, M.V.1, Ramos, C.1, Tarazona, J.V.1, 1 ABSTRACT- Bioaccumulation and biomagnification is a hazard property of concern in risk assessment of chemicals. A model, a simple dynamic tool was developed to estimate levels of exposure of organisms in freshwater, marine and terrestrial food-chains. It constitute an easy alternative to incorporate additional exposure routes in higher ecological risk assessment, specially for those protected species for which, real measures of bodyburden concentrations are unlikely. This paper presents the validation of the model to estimate not only the capability of a compound to be bioaccumulated and/or biomagnificated through different trophic organisms, including aquatic and terrestrial predators, but also the possibility to estimate concentrations in higher predators. Parameters considered to model biomagnification properties are: contribution of different exposure routes (waterborne, sediments and food) through different trophic levels (primary producers and several consumers) and real toxicokinetic information such as uptake, metabolism and elimination rates of the chemical within the different trophic groups.. Four compounds with different bioaccumulable and biomagnificable properties have been selected to validate the model. Key words: biomagnification, toxicokinetics, aquatic food chains, terrestrial food chains |
