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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Based on a read-across with isopropyl oleate (CAS: 112-11-8) and a QSAR prediction, Fatty acids, tall oil, Bu ester is assessed as readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

There are no studies on biodegradation available for Fatty acids, tall-oil, Bu esters (CAS 67762-63-4). The assessment of biodegradability was therefore based on a study conducted with the structurally most similar category member, for which data is available, Isopropyl oleate (CAS 112 -11 -8), 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.

Isopropyl oleate (CAS 112 -11 -8) was tested in a CO2-evolution test according to OECD 301B and to GLP (Desmares-Koopmans 1997). The biodegradation of 12 mg/L TOC (nominal) of the test substance was monitored for 28 days. After 28 days, 101.6-102.2% of the initial test substance was degraded.

A QSAR prediction using BIOWIN v4.10 supports the suggestion of ready biodegradability of Fatty acids, tall-oil, Bu esters (SCAE Consortium 2010).

Thus, based on these results and the structural similarity of the substances, Fatty acids, tall-oil, Bu esters (CAS 67762 -63 -4) is considered to be readily biodegradable.