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Environmental fate & pathways

Adsorption / desorption

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Description of key information

A measured Koc is not available for alkenes C11/13/14. A log Koc of 4.98-5.77 has been calculated for dodecene and tetradecene using a QSAR. 

Key value for chemical safety assessment

Additional information

A measured Koc is not available for alkenes C11/13/14. As based on read across their measured 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 used. If the calculated Koc proves to be influential in the risk assessment then it may be necessary to conduct a new study.

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 (e.g. Sablijc and Gusten, 1995). The log Kow of dodecene and tetradecene falls within the applicability domain of this model and the calculated values are read across to alkenes C11/13/14. The calculated log Koc is 4.98 -5.77, and these values will be used in the risk assessment.