Registration Dossier
Registration Dossier
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EC number: 500-018-3 | CAS number: 9005-64-5 1 - 6.5 moles ethoxylated
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Readily biodegradable: 62.5% (O2 consumption) in 28 days
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
One ready biodegradation study is available for Sorbitan monolaurate, ethoxylated (CAS No. 9005-64-5).
The key study carried out with Sorbitan monolaurate, ethoxylated (CAS No. 9005-64-5), was conducted following the OECD Guideline 301 F and according to GLP (Simon, 2012). Activated sludge from a municipal sewage treatment plant was used as inoculum. During the 28-day test period with a test substance concentration of 25 mg/L, biodegradation reached 62.5%, based on O2 consumption. Since the substance is a UVCB and thus consists of constituents with different chain lengths, sequential (instead of concurrent) biodegradation can take place, but all constituents can be considered as readily biodegradable. Thus, referring to Annex I to the OECD Guideline for Testing of Chemicals ‘Revised introduction to the OECD guidelines for testing of chemicals, section 3’ (OECD, March 2006), the 10-day window should not be considered for this UVCB substance and due to a degradation of > 60% within 28 days the substance can be regarded as readily biodegradable.
In conclusion, Sorbitan monolaurate, ethoxylated (CAS No. 9005-64-5) can be considered readily biodegradable according to OECD criteria.
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