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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

In an enhanced OECD301B study the registration substance (17 mg/L; 10.8 mg C/L) reached the required level of 60% degradation to be ultimately biodegradable within 43 days using a non-adapted municipal activated sludge. Continuous degradation could be observed starting at day 6 reaching a maximum of 91% degradation on day 60. The only enhancement was the prolongation to 60 days.

 

In a standard OECD 301B CO2 EvolutionTest using a non-adapted municipal activated sludg the registration substance (10 mg/L) was not readily biodegradable, but a continuous degradation starting at day 9 could be observed reaching a maximum degradation of 24% after 28 days.

Under the test conditions of an OECD 302B Zahn-Wellens Test the registration substance was not inherently biodegradable.

 

Assessing the whole set of information the substance is not readily biodegradable and did not reach the required pass level in a study on inherent biodegradation, but a continuous degradation could be observed in the two existing studies on ready biodegradability. The substance reached the pass level of 60% degradation after 43 days and a maximum degradation of 91% on day 60. The substance is therefore ultimately biodegradable within 43 days.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed
Type of water:
freshwater

Additional information