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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

One well detailed study but significantly different from standard guideline recommendations is available but no DT 50 value was reported or could be derived from this study.

Key value for chemical safety assessment

Additional information

One well detailed study (Wilson et al., 1986) but significantly different from standard guideline recommendations is available. The behaviour of commonly occurring contaminants was examined in microcosms constructed with authentic aquifer material that receives municipal landfill leachate and is known to support methanogenesis. All manipulations were performed in anaerobic conditions and sterile controls were performed by autoclaving at 121°C.

The disappearance of 1,1-dichloroethylene was not rapid and a lag period of 16 weeks was required before significant degradation occurred compared to autoclaved controls. After 40 weeks, there was a decrease of 60 % to 100 % of the concentration of 1,1-dichloroethylene compared with autoclaved control. There was a decrease of 87 % to 100 % of the concentration of 1,1-dichloroethylene compared with initial concentration.