Registration Dossier
Registration Dossier
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EC number: 206-839-0 | CAS number: 381-73-7
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
Description of key information
Based on the Level III Fugacity Model, the half life period of difluoroacetic acid was estimated. The half life period of difluoroacetic acid in water is 8.7 days, therefore it is considered that the substance will qualiy as not persistent as the half life does not exceed the threshold of 60 days.
Key value for chemical safety assessment
- Half-life in freshwater:
- 8.7 d
- at the temperature of:
- 25 °C
- Half-life in freshwater sediment:
- 78 d
- at the temperature of:
- 25 °C
Additional information
Based on the Level III Fugacity Model, the half life period of difluoroacetic acid was estimated. The half life period of difluoroacetic acid in water is 8.7 days, therefore it is considered that the substance will qualiy as not persistent as the half life does not exceed the threshold of 60 days.
So, it can be confirmed that the substance is readily biodegradable in water medium whereas in sediment the half life is 78 days and based on this value it can be inferred that the substance is persistent in sediment medium and is not readily biodegradable probably due to the anaerobic conditions existing in most sediment. However, it can be observed that difluoroacetic acid does not diffuse in the sediment medium since it's percentage in the sediment medium is reported to be 0% and hence persistence in the sediment compartment is not likely to be critical.
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