In current bioassay approaches for assessing sediment toxicity, whole organisms or in vitro systems are exposed to various sediment fractions (e.g. whole sediment, pore water, extracts) considering different exposure scenarios. Whole-sediment exposure protocols represent the most realistic scenario. However, until now the interpretation of sediment contact test results is associated with uncertainties due to the complexity of sediments as test matrix. The aim of the SeKT project was to compare recently developed freshwater sediment tests by addressing reference conditions, control sediments and toxicity thresholds for these test systems. After finding suitable natural and artificial control sediments for the various test systems, these sediments were spiked with two mixtures of pollutants (heavy metals/organic substances). The toxicity of these sediments was assessed with a test battery using bacteria, fungi, nematodes, oligochaetes, fish, and higher plants as test organisms. Sensitivity, bioavailability and uptake routes were discussed, and the various concentration-response-curves obtained for the different mixtures, sediments and test systems are compared. At ECT, sediment tests with the endobenthic oligochaete Lumbriculus variegatus were performed.
ECT Oekotoxikologie GmbH was founded as a privately owned, independent enterprise in 1993, and joined the SynTech Research Group in November 2021.
In compliance with Good Laboratory Practice (GLP), we perform standardised ecotoxicological tests in the laboratory as well as at semi-field and field level.
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ECT Oekotoxikologie GmbH
Böttgerstraße 2 – 14
65439 Flörsheim am Main
Phone: +49 6145 9564-0
Fax: +49 6145 9564-99