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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The test substance was degraded 100% after 28 days. Based on this the test material has a potential for biodegradation in the marine environment. This marine biodegradation is also considered relevant for freshwater.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

Biodegradation testing was performed on the test substance R-2581 (Carbohydrazide) based on OECD Guideline 306 "Biodegradability in Seawater - Closed Bottle Test".

 

According to OECD 306, a test is considered valid if the percentage degradation of the reference substance (inoculum control) has reached the level of 50% within 5 days (the lag phase not included) and the blank respiration has not exceeded 30% of the oxygen in the test bottle. In this test the activity of the inoculum was satisfactory. The inoculum control was degraded by 66% within 5 days, ie the test is considered valid. Moreover, the oxygen depletion in the inoculum blank did not exceed 30% of the oxygen in the test bottle.

 

A test substance has a potential for biodegradation in the marine environment if it has been degraded ≥ 60% within 28 days.

 

The test substance was degraded 100% after 28 days. Based on this the test material has a potential for biodegradation in the marine environment.