Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Diisopropylbenzene hydroperoxide was not biodegraded in the 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

The ready biodegradability of the test item diisopropylbenzene hydroperoxide 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 (Van Ginkel, 2013). The test was prolonged because the pass level was not reached at Day 28.

 

Diisopropylbenzene hydroperoxide was not biodegraded in the Closed Bottle test (28 days and prolonged) and should therefore not be classified as readily biodegradable. However the lack of biodegradation in the Closed Bottle test does not mean that diisopropylbenzene 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 1.4 mg/L and by the total mineralization of the reference compound, sodium acetate. Sodium acetate was degraded by 72% 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.

 

Diisopropylbenzene hydroperoxide did not cause a reduction in the endogenous respiration. The test substance is therefore not considered to be inhibitory to the inoculum.