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Sediment toxicity

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Description of key information

- NOEC (28 d): ≥1000 mg/kg sediment dw test mat. (nominal) based on: development rate
- EC50 (28 d): >1000 mg/kg sediment dw test mat. (nominal) based on: development rate
- NOEC (28 d): 560 mg/kg sediment dw test mat. (meas. (arithm. mean)) based on: mortality and emergence ratio
- EC50 (28 d): >1000 mg/kg sediment dw test mat. (nominal) based on: mortality and emergence ratio

Key value for chemical safety assessment

Additional information

The toxicity of the substance has been determined in a test with the sediment organism Chironomus tentans. The test was conducted in accordance with OECD Test Guideline 218.

Chironomus tentans were exposed to formulated spiked sediment nominal loading rates of 100, 180, 320, 560 and 1000 mg/kg of test material over a period of 28 days. The study was carried out according to GLP and analytical monitoring took place. Analytical work on the ‘wet’ sediment was problematic, therefore analysis on the ‘dry’ sediment was also carried out.

The test results, expressed as the EC50and NOEC values, showed that the sample was not toxic to sediment organisms at 1000 mg/kg over the time period tested.

Analysis of the ‘dry’ sediment on the day of preparation (Day -7) showed measured concentrations to range from 90% to 111% of nominal. Analysis of the overlying and interstitial pore water on Days 0 and 28 showed measured concentrations to be <LOQ.