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Diss Factsheets

Environmental fate & pathways

Biodegradation in water: screening tests

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Administrative data

Link to relevant study record(s)

Description of key information

Not readily biodegradable

Key value for chemical safety assessment

Additional information

The substance was screened for ready biodegradation potential in three BOD5 and COD tests (1977). All tests gave BOD5 / COD ratios of approximately 0.04.

According to the CLP Regulation EC n. 1272/2008, Annex I, Part 4, subsection which states, "One way of demonstrating rapid degradation utilises the biodegradation screening tests designed to determine whether an organic substance is ‘readily biodegradable’. Where such data are not available, a BOD(5 days)/COD ratio ≥ 0,5 is considered as indicative of rapid degradation."

The ratios BOD5/COD are approximately 0.04, this value is less than 0.5 as given in the above regulation. Therefore, the test substance shows no evidence of rapid biodegradation.