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2I - High-tiered studies (MOP/116) Influence of ageing on the toxicity of pyrene to springtails. Jensen, John1, 1 National Environmental Research Institute, Silkeborg, Århus Amt, Denmark ABSTRACT- One of the major obstacles in ecological risk assessment is how to include aspect of bioavailability. The processes involved in bioavailability of organic contaminants are typically described as diffusion into nano-pores and sorption (adsorption and partitioning) to organic matter. These findings suggest that the hazard and risk from toxic chemicals diminish as the compounds persist in soil. A risk based assessment procedure using total contaminant concentrations will therefore tend to overestimate risks, as no consideration is given to the likely reduction in contaminant bioavailability often seen in historically contaminated and aged soils. A new EU project (www.liberation.dk) aims at linking chemical and biological bioavailability measures with observed ecotoxicological effects in soil and surface water, and at the same time study the underlying processes that may explain these observations. This poster will show some of the first result of an ageing study with springtails exposed to the PAH pyrene in three different soils. The sub-lethal toxicity to springtails and the fate of pyrene is assessed after ageing periods in the range of 0-13 weeks. Key words: bioavailability, ecotoxicity, ageing, PAHs |
