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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Two screening test were performed to assess the biodegradability of the test substance in water. 
In the first test, a biodegradation of 21% was reached at Day 28.
In the second test, a biodegradation of 20% was also reached at Day 28. The test was extended up to Day 60. A biodegradation of 61% was obtained at this date.

Key value for chemical safety assessment

Biodegradation in water:
inherently biodegradable, fulfilling specific criteria

Additional information

Two screening test were performed according to OECD 301B and D testing guidelines to assess the biodegradability of the test substance in water. The first one used non-adapted activated sludge as source of inoculum whereas non-adapted river water was used in the second.

The test item attained 21% and 20% of biodegradation after 28 days, respectively. The second test was extended and a biodegradation of 61% were reached at Day 60, respectively. Therefore, the test item cannot be considered to be readily biodegradable under the strict terms and conditions of OECD 301B and D testing guidelines. However, the biodegradation continued after Day 28 to reach value higher than 60% indicating a high potential for ultimate biodegradation. Therefore, the test item was considered to be inherently biodegradable and fulfilling specific criteria.