Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Reliable studies on the biodegradation of o-tert-butylphenol are available and included in this dossier. Additionally, reliable studies on the biodegradation of the analogue, o-sec-butylphenol are available and included in the dossier. Although the studies included in the dossier appear to have contradictory results, the lack of degradation seen in the inherent biodegradable test may have been due to the high test concentrations. It is evident from the available studies that both the test substance and the analogue biodegrade.

Therefore, it is conservative and consistent with other alkylphenol results, that the test substance, o-tert-butylphenol, be considered inherently biodegradable.

Reliable measured biodegradation studies for o-tert-butylphenol are available for biodegradation in water and included in the dossier. However, no measured biodegradation in sediment or soil are available for o-tert-butylphenol. The key study result for biodegradation in water indicates that the test substance is inherently biodegradable. Additionally, the substance is not to be applied directly to sediment or soil and direct and indirect exposure of sediment is unlikely. Therefore, as per Annex IX of Regulation (EC) No 1907/2006, testing on biodegradation in sediment or soil is not necessary.