Registration Dossier
Registration Dossier
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EC number: 438-390-3 | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Alkane 6 is expected to adsorb strongly to soils and sediment.
Key value for chemical safety assessment
Additional information
Alkane 6 is a poly alpha olefin, and although it was not registered as a member of the Poly alpha olefin (PAO) category, it is appropriate to consider the PAO category for read-across.
A measured Koc is not available for any member of the Polyalphaolefin (PAO) category. As the available measured log Kow are >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.
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). However, for the polyalphaolefin (PAO) category, the category member with the lowest carbon number (and therefore expected lowest log Kow) has a calculated log Kow of 10.09 -11.71 and therefore falls outside the applicability domains of these models (log Kow up to 7.5 for Sablijc and Gusten, 1995). There is a clear trend of increasing Koc with increasing log Kow for non-ionic substances. Therefore, a Koc has been calculated based on the highest log Kow within the QSAR domain as a lower estimate of the Koc of polyalphaolefin (PAO) category members. The calculated log Koc is >6.2.
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