Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Based on the closed bottle test performed, it has to be concluded that 4,4-DDS is not biodegradable within 28 days.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

The percent biodegradation of the toxicity control treatment (containing test substance and reference substance) was significantly lower than in the reference substance treatment, especially after Day 14. However, the toxicity control treatment reached pass levels within the first seven days of the test, and the percent biodegradation at Day 14 was the same as in the reference substance treatment. Therefore, it is unlikely that the lack of the biodegradation observed in the test substance bottles was caused by toxicity of the test substance to the microbes.