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Interactive Poster Session: Soil Ecotoxicology (TU18/2) Terrestrial ecotoxicity - can aquatic ecotoxicity data give a clue? Simon, Markus1, Hund-Rinke, Kerstin1, Herrchen, Monika1, Nagel, Roland2, 1 Fraunhofer Institute for Molecular Biology and Applied Ecology (IME), Schmallenberg, Germany2 Dresden University of Technology, Dresden, Germany ABSTRACT- The current situation with respect to amount and quality of existing ecotoxicity data can be characterized by an imbalance between the aquatic and terrestrial/sediment compartment. This is due to the historical development in environmental management primarily focussing on clean air and water and only recently considering soil and sediment protection and remediation of contaminated sites. But this is also due to the (relative) ease in aquatic ecotoxicity testing. In this project, sponsored by CFEC-LRI, it should be investigated whether from aquatic ecotoxicity data it can be extrapolated to the effects in sediment and soil. The extrapolation procedure will be elaborated on the basis of eight selected compounds. Main emphasis is laid on organic chemicals which persist and bioaccumulate. Furthermore one metal compound is included. Following substances were selected: Benzo(a)pyrene, Tributyltin, Pentachlorophenol, 2,4-Dichlorophenol, 3,4-Dichloroaniline, Trinitrotoluol, Dichloro-diphenyl-trichloroethane (DDT), Cadmiumchloride. For the terrestrial compartment following test organisms and test parameter were selected: soil microorganisms (respiration, nitrification), earthworms (reproduction), collembolans (reproduction), plants (germination, growth). The selection of the test organisms covers different trophic levels and main exposure routes. Furthermore all tests are standardized at least for the testing of chemicals in a defined soil. The tests with all chemicals are performed in three soils differing in their physicochemical properties (e.g. different particle size distribution and humus content to obtain different sorption). A sandy, a loamy and a silty soil are included. Up to now EC50 values for six chemicals were elaborated. The data show a large variety and are therefore a suitable basis for the following extrapolation procedures. It can be seen that the toxicity of the test substances differs, the differences in toxicity depend on the soil, the sensitivity of the test organisms differs up to two decimal powers and the sensitivity for one group of organisms differs depending on species and activity. The financial sponsorship by CFIC-LRI is gratefully acknowledged. Key words: aquatic ecotoxicity, terrestrial ecotoxicity, organic chemicals, metal compound |
