Registration Dossier
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EC number: 278-928-2 | CAS number: 78491-02-8
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
Two reliable key studies are available. In a continuous activated sludge study (modified OECD 303A method), removal averaged 86.4% over 4 weeks, with 55.1% mineralisation to CO2 and 21.5% of applied radioactivity remaining in the effluent stream. In a die-away test designed to simulate continuous emission to a wastewater treatment plant at 0.02 mg/l, 86.4% mineralisation was recorded with a half-life of 1.5h (from 14CO2 evolution).
Key value for chemical safety assessment
- Half-life in freshwater:
- 1.5 h
- at the temperature of:
- 20 °C
Additional information
Typical influent concentration in local sewage treatment plants following the expected domestic use of products containing the test substance was estimated at 1.1E-04 mg/l. However higher concentrations were employed in simulation testing, to ensure reliable analytical detection.
In the definitive die-away test, half-lives were determined for mineralisation (1.2h) and parent substance disappearance from supernatant (3.5h).
Rapid biodegradation within local treatment plants is predicted under the expected conditions of domestic usage.
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