Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

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Additional information

Propylene oxide was found ready biodegradable (89% after 28 days) under aerobic conditions in a modified MITI test (MITI 1988). Propylene oxide is not readily biodegradable under the stringent conditions of a closed bottle biodegradation test (Shell Research Ltd., 1985).The available studies indicate that in general propylene oxide can assumed to be ready biodegradable, but under certain stringent conditions this may not be the case.

Due to the fact that the substance is considered ready biodegradable, no significant concentrations are present in the water and sediment compartments. This is supported by exposure assessment with EUSES. The maximal local PEC value that was calculated was 2.31.10-3mg/L for freshwater, 8.65.10-4mg/L for seawater, 2.37.10-3mg/kg (w. w.) for the freshwater sediment, 8.87.10-4mg/kg (w. w.) for marine sediment and 0.0013 mg/kg (w.w) for the soil compartment. Since these concentrations are very low, no significant exposure of the water and sediment compartments is assumed and therefore simulation tests are not needed.