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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The substance is readily biodegradable

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Biodegradation was investigated in a OCED guideline 301D (Stolte et al. 2008), non GLP, using municipal sludge as inoculum. After 31 days the biodegradation of 1,2 -dimethylimidazole was 100%. After a lag-phase of 17 days, degradation starts with 9%. After 24 d 93% of the substance was biodegradated, thus the 10 day window was passed.

According to GHS ANNEX 9 Chapter A9. the positive results in ready biodegradability tests could be considered valid, irrespective of negative results. Thus, the study on biodegradation according to enhanced OECD guideline 301B (BASF 2012) which reveals a biodegradation of 60 -70% after 60 days is not considered to trigger the classification.