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Environmental fate & pathways

Adsorption / desorption

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Description of key information

On the basis of read across, icos-1-ene has a log Koc of >6.63.

Key value for chemical safety assessment

Additional information

A measured Koc is not available for icos-1 -ene. As the calculated log Kow of icos-1 -ene 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 icos-1 -ene falls outside the applicability domain of this model. There is a clear trend across this category of increasing log Koc with increasing carbon number. Therefore, on the basis of read across from hexadec-1 -ene the log Koc for icos-1 -ene is >6.63.