Registration Dossier
Registration Dossier
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EC number: 242-615-9 | CAS number: 18835-33-1
Adsorption / desorption
Administrative data
Link to relevant study record(s)
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.
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