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(19-04) Soil Ciliate Bioassay - Missing Link between Microflora and Earthworm Testing in Soil Toxicity Assessment. Berthold, Aline*,1, Jakl, Thomas2, 1 University of Veterinary Medicine, Vienna, Austria2 Federal Ministry for Agriculture and Environment, Vienna, Austria ABSTRACT- Currently EU-commissionary working groups are discussing about how to widen the scope of the existing classification and labelling system for industrial chemicals in order to adequately consider hazards for the terrestrial biota in the classification labelling system of chemical products as well as pesticides. The classification system concerning the aquatic compartment is built up surrogating an aquatic food chain: algae - crustacea - fish. Up to now only microflora and earthworm tests are performed for the subsoil compartment. To achieve a more realistic assessment at least one functional group for a basic food chain is missing: protozoa are an ideal missing link. An advanced bioassay using the soil ciliate Colpoda inflata is introduced. The results of the EC50 concerning growth inhibition for some selected heavy metals (Cd, Cr), industrial chemicals (acetone, potassium dichromate) and pesticides (atrazine, metolachlor) will be presented. A comparison with soil organisms literature data will additionally be given. Key words: soil toxicity assessment, ciliates (Ciliophora, Protozoa), advanced bioassay, chemicals and pesticides |
