Registration Dossier

Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Discussion of anaerobic biodegradation.

Key value for chemical safety assessment

Additional information

A variety of anaerobic sediments and soils consumed CFC-12 (CF2Cl2). An aerobic soil did not. Active microbial metabolism was required for CFC-12 uptake in all of the sediments examined. These findings demonstrate that CFC-12 is not biochemically inert under anaerobic conditions. This suggests that anaerobic degradation of CFC-12 in anaerobic landfills might prevent some disposed CFC-12 from entering the atmposhere. The results also suggest that CFC-12 cannot be used as stable tracers in anaerobic environments.

Furthermore, although the microbial sink for atmospheric CFC-12 is much less than current anthropogenic release, this sink could have a significant long-term effect on the amount of CFC-12 reaching the stratosphere.