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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Not readily biodegradable (according to OECD criteria)

Key value for chemical safety assessment

Additional information

Assessment of the parent compound Benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-,C7-9-branched alkyl esters (CAS: 125643 -61 -0)

The substance is not readily biodegradable as established in an OECD 301B test (CIBA 1989).

According to a calculation using OASIS catalogic v.5.1, 1M Benzenepropanoic acid, 3,5-bis(1,1 -dimethylethyl)-4-hydroxy-,C7-9-branched alkyl esters results in the formation of 80% Metilox acid (CAS: 20170 -32 -5) within 28 days under the test conditions of an OECD 301C test, and by thereby supporting the observation of the OECD 308 test.


Supporting assessment of the impurity Metilox (CAS 6386-38-5)

A biodegradation study (1998) according to OECD guideline No. 301C was conducted on a product containing approximately 6% of free Metilox. It has been shown in this study by specific analysis, that Metilox was completely degraded to Metilox acid (CAS 20170-32-5) after 28 days.

Supporting assessment of the major degradation product Metilox acid (CAS: 20170-32-5)

Metilox acid is not readily biodegradable in the Modified Sturm test with 3-7% degradation at 10.3 and 20.3 mg/l.