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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Due to a high ThOD of 2.91 mg O2/mg test item, the test item suspension with a concentration of 25 mg/L met the criteria of 50 – 100 mg ThOD or COD/L, as demanded in the guideline OECD 301 F. At a concentration of 50 mg/L and 25 mg/L, the test item SymMollient® S obtained a biodegradation above 60 % (74% and 84 %, respectively) within the 10-day-window. The biodegradation of the item mixture in the toxicity control was found to be 38 % after 14 days of incubation. Thus, the demanded threshold value of 25 % is exceeded and the test item SymMollient® S can be identified as non toxic to micro-organisms in a ready biodegradability test at a tested concentration of 50 mg/L (ThOD 145.5 mg O2).

According to the guideline, the test item SymMollient® S can be identified as readily biodegradable under the chosen test conditions.