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EC number: 307-301-9
CAS number: 97593-01-6
A measured log Koc is available for alkenes C20 - 24. Fox and White (2008) report a log Koc of >5.63 using the HPLC screening column method. Other than this single experimental value, measured log Koc are not available for any other category members. Instead, log Koc have been calculated on the basis of measured or calculated log Kow using a QSAR. The calculated log Koc increase with increasing carbon number.
Log Kow is observed to increase with increasing carbon number for
members of this category. As the measured log Kow of the category member
with the lowest carbon number (C6, hex-1-ene) is >3 the
adsorption/desorption endpoint cannot be waived for any category member.
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 log 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 log Koc of
non-polar hydrocarbons on the basis of their log Kow (e.g. Sabljic and
Gusten, 1995). Category members with carbon number ranges of C6-C16 fall
within the applicability domain of this QSAR. For category members with
carbon numbers above this log Koc are not calculated, but instead read
across from other category members based on the observed trend in
calculated log Koc. The calculated log Koc support the measured value
for alkenes C20-24.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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