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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The ready biodegradability of the test substance was investigated according to the OECD guideline 301 D (1992). The test item reached 81 % degradation after 21 days. The test item is regarded to be in the 10-d-window and after 28 days readily biodegradable. Furthermore, the test substance showed no inhibitory effect on the microorganisms.

 

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

The ready biodegradability of the test substance was investigated according to the OECD guideline 301 D: Closed Bottle test (1992). The biodegradation of the test substance was followed by exposing it to microorganisms from the effluent of a domestic waste water treatment plant over 28 days. The functional control reached the pass level > 60 % after 6 days. After 14 days a biodegradation rate of 79 % was reached. In the toxicity control 72 % degradation occurred within 14 days. The degradation of the reference item was not inhibited by the test item. All validity criteria were fulfilled. The test item reached the 10 % level after 1 day. The biodegradation came to 66 % after 14 days and to a maximum of 81 % degradation after 21 days. The test item is regarded to be in the 10-d-window and after 28 days readily biodegradable.