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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

If released into water, the UVCB substance can be expected to be poorly biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

In a ready biodegradability test with the UVCB substance (CAS 68411 -46 -1) following OECD guideline 301B, no significant biodegradation was observed. 1% degradation after 28 days was reported in this GLP study (Ciba-Geigy 1988). Initial test substance concentrations were 10.6 and 20.1 mg/L. The study was therefore performed at concentrations exceeding the water solubility of <5 µg/L by a factor > 2000x. Thus, most of the test material used in the test was not accessible for biodegrading processes. Biodegradation of about 1% after 28 days was reported.

Overall, although biodegradation is expected to occur in the water-soluble fraction, the biodegradation rate is expected to be too small to go below the persistency criteria.

Therefore, the UVCB substance is assumed to be poorly biodegradable.