Registration Dossier

Environmental fate & pathways

Adsorption / desorption

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The mean calculated log Koc for benzyl butyl phthalate is 3.63

Key value for chemical safety assessment

Additional information

Experimental adsorption/desorption data is not available for benzyl butyl phthalate. As the log Kow is >3 the adsorption/desorption endpoint cannot be waived. However, ECHA's Guidance on Information Requirements and Chemical Safety Assessment R7a Endpoint Specific Guidance (2008) indicates that before commissioning a new study alternative sources of data (e.g. QSAR) on the adsorption/desorption potential of a chemical should be used.

Soil sorption of non-ionic substances can be estimated from their log Kow. Several QSAR have been developed that calculate the Koc of non-polar hydrocarbons on the basis of their log Kow. Two QSAR have been used to calculate the log Koc of benzyl butyl phthalate. The calculated log Koc are 3.41 and 3.86, and the mean of these values has been used in the risk assessment.