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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

The major constituent 2,2',2''-nitrilotriethanol is rapidly biodegradable based on studies performed by West (1996) and Gerike (1978). The second largest constituent has also been found readily biodegradable.

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable

Additional information

As key study regarding the biodegradation of 2,2',2''-nitrilotriethanol a test performed by West et al. (1996) is identified. In a test with activated sludge biodegradation half-lifes between 0.01 and 0.51 days and mineralization half-lifes between 0.24 and 0.67 days were found, depending on the initial concentration of the test substance (164 and 818 mg/L) and the concentration of the activated sludge (0.6 and 5.7 mg/L MLSS).

These results indicate, that 2,2’,2’’-nitrilotriethanol is readily biodegradable. A ready test performed by Gerike (1978) according to a precursor of the Modified OECD Screeening Test (OECD TG 301 E) using non-adapted effluent from a waste water treatment plant as inoculum supports these results.

As indicated by a manometric respirometry test (OECD 301 F) following GLP, DEA is readily biodegradable since the substance was degraded by 93 % after 28 days related to BOD.