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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable: 79.8% (CO2 evolution) after 28 d (OECD 301B), read across.

Key value for chemical safety assessment

Additional information

Data on the ready biodegradability of 2-ethylhexanol nonanoate (CAS 59587-44-9) are not available. The assessment of biodegradability was, therefore, based on studies conducted with the structurally similar substances, Fatty acids, C8-10, 2-ethylhexyl esters (CAS 649747-80-8) and Fatty acids, C8-16, 2-ethylhexyl esters (CAS 135800-37-2), as part of a read across approach, which is in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5.
The biodegradability Fatty acids, C8-10, 2-ethylhexyl esters (CAS 649747-80-8) was tested in a study conducted according to OECD guideline 301B (Bouillon, 2010). Domestic activated sludge was exposed to the test substance for 28 days. The biodegradation rate was determined by measuring the CO2 evolution. After 28 days, the test substance reached a degradation rate of 79.8%. The 10-day window criterion, defined for mono-constituent substances, was met, although it would not be required since the substance is a UVCBs. The result is supported by a study on the ready biodegradability of Fatty acids, C8-16, 2-ethylhexyl esters (CAS 135800-37-2) (Richterich, 2002). The study was accomplished according to OECD guideline 301D.The biodegradability was tested at the substance concentrations 2 mg/L and 5 mg/L respectively. The test was terminated after 30 days. Based on the O2 consumption of the activated sludge a degradation rate of 97% was determined at a substance concentration of 2 mg/L. At a test concentration of 5 mg/L a degradation rate > 65% was reached after 30 days of incubation. Thus, based on the above mentioned results, and due to the structural and profile similarities of the substances, 2-ethylhexanol nonanoate (CAS 59587-44-9) is considered to be readily biodegradable.