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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Description of key information

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

Key value for chemical safety assessment

Additional information

A measured Koc is not available for hexacos-1 -ene. As the calculated log Kow of hexacos-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 QSARs have been developed that calculate the Koc of non-polar hydrocarbons on the basis of their log Kow (e.g. Sabljic and Gusten, 1995). This model was not used for hexacos-1 -ene as the log Kow falls outside the applicability domain of this model. However, there is a clear trend across this category of increasing log Koc with increasing carbon number. The alpha olefin with the highest carbon number within the range of this model is hexadec-1-ene. On the basis of read across from hexadec-1-ene the log Koc for hexacos-1-ene is >6.63.