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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 according to OECD criteria.

Key value for chemical safety assessment

Additional information

In a ready biodegradability study according to OECD 301 B and under GLP the test substance was assessed over a 28 day period by the Modified Sturm Test (RCC Notox B.V. 1989). The nominal test concentrations were 10 and 20 mg/L. The biodegradation was found to be 14.1 % and 3.5 % for 10 mg/L and 20 mg/L test substance, respectively. The reference compound sodium acetate degraded with more than 60% during the exposure period, thus confirming suitability of the activated sludge. These findings are supported by a second study according to OECD 301 (Ciba-Geigy Ltd. 1986). The test substance was 13 % biodegradable after 28 d for 10 mg/L and 8 % biodegradable after 28 d for 20 mg/L. Therefore, the test substance is considered as poorly biodegradable.