Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Assessment of hydrolytic stability was not carried out using Method C7 of Commission Directive 92/69/EEC and Method 111 of the OECD Guidelines for Testing of Chemicals, 13 April 2004 due to low solubility in aqueous media.  Using HYDROWIN v1.67 (© 2000 US Environmental Protection Agency), half-lives for the different components ranged from 2.65 years to 9.85 years.

The average rate of degradation determined in a ready biodegradation study on the submission substance was 57%, which means that the substance cannot be classed as readily biodegradable. The log Pow was determined to be >6.50.

Based on the above factors, the substance would normally be classified as R53: may cause long-term adverse effects on the aquatic environment. However, as the substance is a mixture (of both branched and linear chains) it is classified in accordance with the Classification, Packaging and Labelling of Dangerous Preparations Directive (99/45/EEC), now replaced by the CLP regulation, where a mixture is classified with R53/Aquatic Chronic 4 only if the sum of components classified this way is ≥ 25% w/w. If the sum is less than this figure, i.e. the linear chains are present at above 75% (which they are in Hatcol 1760), then the mixture should not be classified for the environment.

Reliability

The above studies have all been ranked reliability 1 (reliability 2 for the QSAR prediction) according to the scoring system of Klimisch et al. This ranking was deemed appropriate because the studies were conducted to GLP and in compliance with agreed protocols, with no or minor deviations from standard test guidelines and/or minor methodological deficiencies, which do not affect the quality of relevant results.