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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

Two Klimisch-1-1rated studies were carried out on ready biodegradability, i.e. a CO2 evolution test (1996) and a manometric respirometry test. In accordance with the weight of evidence approach, the manometric respirometry test was considered as more reliable. Undecylenic acid is assessed as readily biodegradable. 

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Two Klimisch-1-rated studies were carried out on ready biodegradability, i.e. a CO2 evolution test (1996) and a manometric respirometry test. Whereas the grade of biodegradability from of the CO2 evolution test was 51 %, and thus failed slightly the 60% degradability criteria for ready biodegradability, the study with the manometric respirometer revealed a grade of degradability of 94%, thus the substance clearly was ready biodegradable. In accordance with the weight of evidence approach, the manometric respirometry test was considered to have delivered the data of higher validity and reliability. Taking into account all of the information available, undecylenic acid is assessed as readily biodegradable.