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Partition coefficient

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Description of key information

log Kow (constituents of the substance): ≥5.57 to >7.2 at 35°C (read-across)
log Kow (constituents): 5.11 - 9.18 at 20°C (QSAR)

Key value for chemical safety assessment

Additional information

There are no reliable measured n-octanol/water partition coefficient data for the registration substance. However, reliable data are available for related substances in the relevant carbon number range.

In OECD 117 studies using the HPLC method, which were conducted in compliance with GLP, Hydrocarbons, C10-C13, n-alkanes, isoalkanes, <2% aromatics (GS190) had measured Kow values in the range ≥3.69 x 105 to ≤4.13 x 106 (log10Kow ≥5.57 to ≤6.62); Hydrocarbons, C12-C15, n-alkanes, isoalkanes, <2% aromatics (GS215) had measured Kow values in the range 8.20 x 105 to 1.58 x 107 (log10Kow ≥5.91 to ≤7.2) at 35°C and pH 7.7; Hydrocarbons, C14-C16, n-alkanes, isoalkanes, <2% aromatics (GS250) has measured Kow values in the range 7.14 x 106 to >1.58 x 107 (log10 Kow 6.85 to >7.2) at 35°C and pH 7.3. Hydrocarbons, C15 - C19, n-alkanes, isoalkanes, <2% aromatics has a measured Kow value of > 1.58 x 107 (log10Kow >7.2) at 35°C and pH 7.3. The results are considered to be reliable and are used as weight of evidence.

As supporting information, predicted log Kow values for individual constituents of the submission substance have been calculated. The log Kow of each constituent has been predicted using a validated QSAR estimation method. The prediction method uses a fragment method and log Kow increases with increasing carbon number. The individual constituents of the substance have predicted log Kow values in the range 5.11 - 9.18 at 20°C.