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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The biodegradation of the substance was measured in a test performed according to OECD 301B test guideline and GLP principles.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The 'ready' biodegradability of the test substance was assessed using the carbon dioxide (CO2) evolution test (modified Sturm test) according to OECD guideline 301B. The source of test organisms was activated sludge freshly obtained from a municipal sewage treatment plant. A single test concentration of 19.6 mg substance/L (corresponding to 12 mg TOC/L) was tested during 28 days. The CO2 evolution was measured as parameter for biodegradation. Only 1% degradation was observed after 28 days. Based on the obtained results, the substance Polyfunctional polyaziridine, based on TMPTA and Propylene imine was classified as not readily biodegradable. The present study is classified as reliable without restrictions since all acceptability criteria stated in the guideline were met.