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Environmental fate & pathways

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The diphenyl ether substane is regarded as "readily biodegradable". The biodegradability of the test substance was determined in a BOD test (American Public Health Association, American Water Works) similar to the OECD 301D Closed Bottle Test, and in semi-continuous activated sludge (SCAS) tests. Biodegradation is expected to be the dominant process affecting fate and lifetime of this substance in the environment. The demonstrated rates and degrees of biodegradation indicate the substance to be not persistent in the environment.

In a bioremediation study, 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.