Registration Dossier
Registration Dossier
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EC number: 287-487-5 | CAS number: 85536-06-7
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Readily biodegradable: 64% in 28 days (ISO 10708)
Key value for chemical safety assessment
Additional information
No experimental data evaluating the biodegradation potential of Glycerides, C8-18 (CAS No. 85536-06-7) are available. Therefore, a ready biodegradability study from an analogue category member, castor oil, hydrogenated (CAS No. 8001-78-3) is used as read-across in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5. Both substances are esters formed by esterification of fatty acids and glycerol. The target substance is predominantly a triglyceride (>80%, the three hydroxyl functional groups of the glycerol molecule are esterified with fatty acids) and includes C8-20 fatty acids (C20 < 5%), with a high content of C18 fatty acids (30-50%). Castor oil, hydrogenated is also predominantly a triglyceride (80% triester content) containing C18 hydrogenated fatty acids. Therefore, the read-across substance will reflect the biodegradation of the larger fatty acids C-chain lengths within Glycerides, C8-18.Generally, larger and branched molecules are considered as a worst-case approach, since the chain length and substitutions are determining factors for biodegradation of fatty acid alcohol esters (Bozcar et al., 2001; Dias and Alexander, 1971). Based on this information, if castor oil, hydrogenated is readily biodegradable (representing C18 fatty acids), Glycerides C8-18 can be also considered as readily biodegradable, since the shorter fatty acids (C8-16) are expected to be biodegraded more easily than the larger ones. Thus, this read-across is justified according toRegulation (EC) No. 1907/2006, Annex XI, 1.5.
One study evaluating the potential for ready biodegradability of castor oil hydrogenated (CAS No. 8001-78-3) is available (Richterich and Mühlberg, 2001). The test was conducted according to the ISO 10708. Activated sludge was exposed for 28 days to the test and biodegradation followed by measuring O2 consumption in the test vessels. After 28 days, the test substance reached 64% biodegradation. As the substance is an UVCB substance and thus, formed by constituents with different degrees of esterification, sequential (instead of concurrent) biodegradation is expected to take place. Thus, referring to Annex I of the OECD Guideline for Testing of Chemicals “Revised introduction to the OECD guidelines for testing of chemicals, section 3” (OECD, 2006), the 10-day window criterion can be disregarded in this case and the substance considered as readily biodegradable.
Based on the results obtained for the structurally related analogue substance (in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5), Glycerides, C8-18 (CAS No. 85536-06-7) can be regarded as readily biodegradable.
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