Registration Dossier
Registration Dossier
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EC number: 293-054-1 | CAS number: 91051-05-7
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Readily biodegradable: 69 - 71% (CO2 evolution) in 28 days; read-across
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
There are no studies on biodegradation available for Fatty acids essential, Et esters (CAS 91051 -05 -7). The assessment of biodegradability was therefore based on studies conducted with the structurally most similar category members, for which data is available, Ethyl linoleate (CAS 544-35-4) and Fatty acids, lanolin, isopropyl esters (CAS 63393 -93 -1), as part of a read across approach, which is in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5. Grouping of substance and read across approach. Further justification is given within the endpoint summary 6.1 and within the category justification section 13. In this case of read-across, the best suited (highest degree of structural similarity, nearest physico-chemical properties) read-across substance was entered into IUCLID. Nevertheless, as can be seen in the data matrix of the category justification in Section 13, all reliable data in the category support the hazard assessment for this endpoint, by showing a consistent pattern of results.
Ethyl linoleate was tested in a CO2 -evolution test according to OECD 301B and to GLP (Desmares-Koopmans 2010). The biodegradation of 12 mg/L TOC (nominal) of the test substance was monitored for 28 days. After 28 days, 69 - 71% of the initial test substance was degraded. Hence, Ethyl linoleate is considered to be readily biodegradable. This is in consistence with all further members of the SCAE C2 -C8 category for which ready biodegradability was observed.
The ready biodegradability study carried out with Fatty acids, lanolin, isopropyl esters (CAS 63393-93-1) was performed following OECD Guideline 301 B and according to GLP (Clarke, 2012). Activated sludge from a domestic sewage treatment plant was used as inoculum. During the 28-day test period, biodegradation reached 67%, based on CO2 evolution. 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.
Based on these findings, Fatty Acids, essential, Et esters is considered to be readily biodegradable.
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