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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Not readily biodegradable: < 15% in 28 days (CO2 evolution; OECD 301 B); read-across

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

No biodegradation studies are available for Fatty acids, C18 unsaturated, trimers, hydrogenated. Therefore, in accordance to Regulation (EC) No 1907/2006 Annex XI, 1.5, a read across to the analogue substances Fatty acids, C18-unsatd., dimers (CAS No. 61788-89-4), Fatty acids, C18-unsatd., dimers, hydrogenated (CAS No. 68783-41-5) and Fatty acids, C18-unsatd., trimers (CAS No. 68937-90-6) was conducted. Further justification is given in the endpoint summary 5 and within the category justification in Section 13.

All key biodegradability studies were performed following the OECD Guideline 301 B, using activated sludge from a municipal wastewater treatment plant as inoculum (Bogers and Coenen, 1988; Kelly and Clayton, 2002). During the 28-day test period, biodegradation reached 7.1% for Fatty acids, C18-unsatd., dimers (CAS No. 61788-89-4), 9.5% for Fatty acids, C18-unsatd., dimers, hydrogenated (CAS No. 68783-41-5) and 11.1% for Fatty acids, C18-unsatd., trimers (CAS No. 68937-90-6). Hence, the substances are not considered as readily biodegradable according to OECD criteria.

Thus, based on the above mentioned results, and due to the structural and profile similarities of the substances, as are explained with in the overall endpoint summary Section 5, it can be concluded that Fatty acids, C18 unsaturated, trimers, hydrogenated is not readily biodegradable according to OECD criteria.