Registration Dossier

Environmental fate & pathways

Biodegradation in water: screening tests

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Readily biodegradable: 66%  in 28 d CO2 Evolution (OECD 301B).

Key value for chemical safety assessment

Biodegradation in water:
readily biodegradable but failing 10-day window

Additional information

A ready biodegradtion study by Battersby 1998 was selected as the key study for the test substance. The key was selected because the study was reviewed to be reliable without restriction. A ready biodegradation value of 66% in 28 days (OECD 301B) was obtained for the test substance. However, other supporting study gave a ready biodegradation values of 82.4% in 28 days (OECD 301B) and 82% in 28 days (OECD 301F) linear C16 alcohols and alcohols C14 -16 linear and branched. These studies gave consistent results that are considered reliable for the purpose of environmental assessment. The test substance is found to be readily biodegradable.

The presence of branching is not expected to reduce extent of biodegradability of the test substance.

The Category hypothesis is that the long chain linear aliphatic alcohol family has at its centre an homologous series of increasing carbon chain length, which is associated with a consistency and predictability in the property data across the group, for the physicochemical, environmental and toxicological property data sets. In view of the structural and chemical similarities, it is considered that the results from a number of reliable repeated dose toxicity studies on single- or multiple-constituent alcohols with appropriate chain lengths can be read across to Alcohols C16-17 branched and linear.

In some cases the CAS and chemical identity stated refer to SDA nomenclature for this substance. In REACH substance identification it is necessary to be more specific as to the chain lengths present. Full details may be found in the CSR.