Registration Dossier
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EC number: 203-910-8 | CAS number: 111-81-9
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
No biodegradation of the test item was observed for 28 days in the first study (OECD 301 B). The observed decomposition of ca. 28% was due to abiotic effects only. This was related to the volatility properties of methyl undecylenate that surely escaped from the test medium. Performing an OECD 301D test was therefore judged more appropriate. Therefore, a second test (OECD 301 D) was carried out and showed a biodegradation of 80% at Day 28. The 10-day window biodegradation criterion was fulfilled. Therefore, methyl undec-10-enoate is considered as readily biodegradable.
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
A first study was carried out to determine the ready biodegradability of test item METHYL UNDEC-10-ENOATE by applying OECD Guideline 301 B (Ready Biodegradability: CO2 Evolution Test). However, the 301B test was not adapted to volatile compounds like methyl undec-10 -enoate that escaped from the test medium. Thus, no biodegradation of the test item was observed for 28 days under the 301B test conditions. The observed decomposition of ca. 28% was due to abiotic effects only. A second study was performed according to slightly modified OECD 301 D (closed bottle test), EU and ISO Test Guidelines, and in compliance with the OECD principles of Good Laboratory Practice. METHYL UNDEC-10-ENOATE was biodegraded by 80% at day 28 in the Closed Bottle test. Over 60% biodegradation was achieved in a period of approximately 5 days immediately following the attainment of 10% biodegradation. Hence, this substance is classified as readily biodegradable.
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