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Variability of sediment-contact tests in freshwater sediments with low-level anthropogenic contamination - Determination of toxicity thresholds |
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| Authors: | S Höss W Ahlf H Hollert M Hammers-Wirtz |
| Institution: | a Ecossa, Giselastr. 6, 82319 Starnberg, Germany b Institute of Biodiversity - Network (IBN), Dreikronengasse 2, 93047 Regensburg, Germany c Institute of Environmental Technology and Energy Economics, Technical University Hamburg-Harburg, Eißendorfer Str. 40, 21071 Hamburg, Germany d ECT Oekotoxikologie, Böttgerstr. 2-14, 65439 Flörsheim, Germany e Department of Ecosystem Analysis, Institute for Environmental Research (Biology 5), RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany f Dr. Fintelmann & Dr. Meyer, Mendelssohnstr. 15D, 22761 Hamburg, Germany g Research Institute for Ecosystem Analysis and Assessment (gaiac), RWTH Aachen University, Worringerweg 1, 52056 Aachen, Germany h Federal Institute of Hydrology (BfG), Am Mainzer Tor 1, 56070 Koblenz, Germany i Chair for Environmental Biology and Chemodynamics, Institute for Environmental Research (Biology 5), RWTH Aachen University, Worringerweg 1, 52074 Aachen, Germany j Nordum GmbH & Co KG, Am Weidenbruch 22, 18126 Kessin/Rostock, Germany |
| Abstract: | Freshwater sediments with low levels of anthropogenic contamination and a broad range of geochemical properties were investigated using various sediment-contact tests in order to study the natural variability and to define toxicity thresholds for the various toxicity endpoints. Tests were performed with bacteria (Arthrobacter globiformis), yeast (Saccharomyces cerevisiae), nematodes (Caenorhabditis elegans), oligochaetes (Lumbriculus variegatus), higher plants (Myriophyllum aquaticum), and the eggs of zebrafish (Danio rerio). The variability in the response of some of the contact tests could be explained by particle size distribution and organic content. Only for two native sediments could a pollution effect not be excluded. Based on the minimal detectable difference (MDD) and the maximal tolerable inhibition (MTI), toxicity thresholds (% inhibition compared to the control) were derived for each toxicity parameter: >20% for plant growth and fish-egg survival, >25% for nematode growth and oligochaete reproduction, >50% for nematode reproduction and >60% for bacterial enzyme activity. |
| Keywords: | Sediment Contact test Toxicity threshold Test variability Test battery |
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