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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Readily biodegradable (according to OECD criteria).

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

In a ready biodegradation test conducted according to test guideline OECD 301C ethylene oxide was determined as readily biodegradable (MITI, 1995). Conway and co-workers (1983, also cited in BUA, 1993) determined the biodegradation of ethylene oxide over a period of 20 days and observed 52 % degradation based on oxygen consumption. In the BUA report concerning ethylene oxide (1993), an additional biodegradation study performed by DOW Chemicals (1978) is presented as well. The method used in this study resembles a Closed Bottle Test (OECD 301D). Based on the parameter oxygen consumption 69 % ethylene oxide degraded in 20 days. For the structural analogous substance propylene oxide an OECD 301C test (MITI, 1992) is available in which a degradation of > 90 % was determined.

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