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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

OECD301D: readily biodegradable. BOD28=68%.
OECD301F: readily biodegradable. BOD28=78%.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

In a guideline and GLP assessment of ready biodegradability by sewage treatment micro-organisms, ethoxypropanol attained 68% degradation after 28 days as measured by oxygen consumed. The biodegradation curve showed that degradation exceeded 60% within 10 days of the degradation attaining 10%; therefore satisfying the 10-day window validation criterion cited in the OECD guidelines. Accordingly, ethoxypropanol is considered to be readily biodegradable under the conditions of this test.

In a guideline and GLP assessment of ready biodegradability by activated sewage sludge micro-organisms, ethoxypropanol attained 78% degradation after 28 days as indicated by daily oxygen consumption. Degradation of the test material exceeded 10% on day 6 of the study and attained 60% on day 15; therefore satisfying the 10-day window validation criterion cited in the OECD guidelines.Accordingly, ethoxypropanol is considered to be readily biodegradable under the conditions of this test.