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Environmental fate & pathways

Biodegradation in water and sediment: simulation tests

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Description of key information

Diphenyl ether has been demonstrated to be readily biodegradable, no further testing concerning this endpoint is needed.  
Existing study showed that diphenyl oxide is readily degraded under aerobic condition in microcosms containing soil and groundwater.

Key value for chemical safety assessment

Half-life in freshwater:
19 d

Additional information

In accordance with Column 2 of REACh Annex IX, the testing is not required as the substance is readily biodegradable.

In a GLP study equivalent to OECD 308 (Aerobic and Anerobic Transformation in Aquatic System), biodegradation of diphenyl ether and other compounds were examined in a natural soil/groundwater system obtained from a site historically contaminated with hydrocarbons. Diphenyl oxide was readily degraded under aerobic condition in microcosms containing soil and groundwater. The incubation time required for 50% disappearance of Diphenyl oxide was in the range of 9.5 to 19.0 days for unamended microcosms. The time required for 50% degradation was found to be 8.0 to 10.5 days for microcosms amended with nutrients.