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Sediment toxicity

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Description of key information

Key value for chemical safety assessment

EC50 or LC50 for freshwater sediment:
826 mg/kg sediment dw

Additional information

An acute test on midge larvae (Chironomus tentans) was performed by Call et al. (2001) following the method recommended by the U.S. Environmental Protection Agency (EPA1600lR-941024). Three different netural sediments were used with a different content of total organic carbon each. After 10 days of exposure, a LC50 for the endpoint mortality of 826 mg/kg sediment dw was measured for the low TOC sediment whereas for the medium and high TOC sediments LC50 values were found to be higher (1664 mg/kg sediment dw and 4730 mg/kg sediment dw, respectively). For derivation of PNEC the lowest LC50 found was applied as well as the equilibrium partitioning method. As the test is investigating sahort-term effects only, the most stringent value of the two different PNEC-derivation methods is apllied for further risk assessment.