Registration Dossier
Registration Dossier
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EC number: 406-530-2 | CAS number: - MDI
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
The substance is not readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
- Type of water:
- freshwater
Additional information
The biodegradation potential of MDI/CHA/ODA was examined in a study in accordance with OECD TG 301B (Modified Sturm Test), and in compliance with GLP criteria. The test substance was inoculated with activated sludge from a municipal sewage treatment plant at nominal test concentrations of 10 mg/L and 20 mg/L for 28 days. Throughout the test the CO2 was trapped in barium hydroxide and was measured by titration of the residual hydroxide. The amount of carbon dioxide produced from the test substance (corrected for that derived from the blank inoculum) is expressed as a percentage of ThCO2. In a positive control over 70% biodegradation was observed within 14 days. The test substance was biodegraded 6% and 9% at the nominal test concentrations of 10 mg/L and 20 mg/L, respectively. Based on these findings, the substance is qualified as not readily biodegradable. The study is valid.
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