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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

EU risk assessment report, p.17 (2009):
In two standard ready biodegradability tests (IUCLID 5.2.1.001), PTBBA failed both the 10-day window and the pass level of 60 % biodegradation of ThOD in 28 days. PTBBA is therefore classified as not readily biodegradable. Inherent biodegradability test results are not available, although the degree of degradation observed in the modified Sturm test (one of the two studies under IUCLID 5.2.1.001) and in some of the other tests indicate that PTBBA might be inherently biodegradable. For modelling purposes, the biodegradation rate constant for STPs is assumed to be zero.

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information