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Environmental fate & pathways

Adsorption / desorption

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Description of key information

A measured Koc is not available for hexadecene. A log Koc of 6.56 has been calculated on the basis of a log Kow of 7.98 using a QSAR.

Key value for chemical safety assessment

Additional information

A measured Koc is not available for hexadecene. As the calculated log Kow of hexadecene 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). The log Kow of hexadecene falls slightly outside the applicability domain of this model, however, the trend in increasing log Koc is consistent with the other alpha olefins in this category. The calculated log Koc is 6.56, and this value will be used in the risk assessment.