Registration Dossier
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EC number: 288-668-1 | CAS number: 85865-69-6
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Readily biodegradable: 87% (O2 consumption) in 28 days
Key value for chemical safety assessment
- Biodegradation in water:
- readily biodegradable
Additional information
There are no ready biodegradation studies available for Fatty acids, C16-18, isobutyl esters (CAS No. 85865-69-6). The assessment was therefore based on studies conducted with structurally most similar category members, for which data is available, Fatty acids, C16-18, butyl esters (CAS No. 85408-76-0) and Fatty acids, C16-18, 2-ethylhexyl esters (CAS No. 91031-48-0), 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 substances were entered into IUCLID. The two read-across substances contain the same composition of fatty acids as Fatty acids, C16-18, isobutyl esters. The first substance also contains a C4 alcohol, but since it is linear, biodegradation could be faster than for the branched isobutyl (Dias and Alexander, 1971). Therefore, the second read-across substance with a C8 branched alcohol was used additionally. Since both read-across substances are readily biodegradable, Fatty acids, C16-18, isobutyl esters is expected to be readily biodegradable as well. Furthermore, 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.
The key ready biodegradability study with Fatty acids, C16-18, butyl esters (CAS No. 85408-76-0) was conducted following the ISO method 10708 (BODIS test) (Richterich, 2001). Domestic, non-adapted activated sludge was used as inoculum. During the 28-day test period, biodegradation reached 82%, based on O2 consumption, and the 10-day window criterion was met.
The key ready biodegradability study with Fatty acids, C16-18, 2-ethylhexyl esters (CAS No. 91031-48-0) was conducted according to OECD guideline 301 F and GLP (Wierich, 1999), using sewage, predominantly domestic (adaptation not specified) as inoculum. During the 28-day test period, biodegradation reach 87%, based on O2 consumption, and the 10-day window criterion was met.
In conclusion, Fatty acids, C16-18, isobutyl esters (CAS No. 85865-69-6) can be considered as readily biodegradable according to OECD criteria.
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