Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

There is no test performed with Tert-amyl hydroperoxide. Ready biodegradability of this substance is read-across from data obtained with 1,1,3,3-Tetramethylbutyl hydroperoxide: 1,1,3,3-Tetramethylbutyl hydroperoxide was not biodegraded in a Closed Bottle test (28 days and prolonged) and should therefore not be classified as readily biodegradable. 

Key value for chemical safety assessment

Biodegradation in water:
under test conditions no biodegradation observed

Additional information

There is no test performed with Tert-amyl hydroperoxide. Ready biodegradability of this substance is read-across from data obtained with1,1,3,3-Tetramethylbutyl hydroperoxide.

 

In order to assess the biotic degradation of 1,1,3,3-Tetramethylbutyl hydroperoxide, a ready biodegradability test was performed which allows the biodegradability to be measured in an aerobic aqueous medium. The ready biodegradability was determined in the Closed Bottle test performed according to slightly modified OECD (OECD TG 301), EU and ISO Test Guidelines, and in compliance with the OECD principles of Good Laboratory Practice.

1,1,3,3-Tetramethylbutyl hydroperoxide did not cause a reduction in the endogenous respiration. The test substance is therefore considered to be non-inhibitory to the inoculum. 1,1,3,3-Tetramethylbutyl hydroperoxide was not biodegraded in the Closed Bottle test (28 days and prolonged) and should therefore not be classified as readily biodegradable. The lack of biodegradation in the Closed Bottle test does not mean that 1,1,3,3-tetramethylbutyl hydroperoxide is recalcitrant in nature because the stringency of the test procedures could account for the recalcitrance in the Closed Bottle test. The test is valid as shown by an endogenous respiration of 0.8 mg/L and by the total mineralization of the reference compound, sodium acetate. Sodium acetate was degraded by 85% of its theoretical oxygen demand after 14 days. Finally, the most important criterion was met by oxygen concentrations >0.5 mg/L in all bottles during the test period.