Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

This substance was not ready biodegradable in the standard screening study, but in several other types of biodegradation studies, 4 -aminophenol was considered inherently biodegradable with pre-adaptation. Three studies observed significant (≥ 66%) biodegradation of the test substance when using pre-adapted sludge, and can be considered inherent, primary biodegradable ( > 20% as defined in OECD Guideline for testing of Chemicals, Revised Introduction to the OECD guidelines for testing of chemicals, section 3, 23 March 2006). Two of the screening studies support the concept that the substance is inherent, ultimate biodegradable (> 70 % as defined in OECD Guideline for testing of Chemicals, Revised Introduction to the OECD guidelines for testing of chemicals, section 3, 23 March 2006) with 92%biodegradation in 22 days with pre-adapted sludge (synthetic activated sludge acclimated to 1000 ppm COD test) using a SCAS unit and > 87 % DOC removal in 5 days. This is an indication that the substance has the potential for degradation under favorable conditions, such as STP or biological treatment plant.

Biodegradation in sediment or soil is likely to be irrelevant as given the physical-chemical properties of this substance, the substance is unlikely to partition to the sediment and soil compartment.