Registration Dossier
Registration Dossier
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EC number: 234-042-8 | CAS number: 10508-09-5
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
OECD Guideline 123, GLP, key study, validity 1:
Log Kow = 4.7 at 25°C
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 4.7
- at the temperature of:
- 25 °C
Additional information
A first study was performed according to OECD Guideline 117 with GLP statement. However, the HPLC method could overestimate the Kow for certain structures: there is some evidence that those containing oxygen may be susceptible to the formation of hydrogen bond within the column that could slow down molecules. That's why the partition coefficient n-octanol/water (Kow) of di-tert-amyl peroxyde was estimated using the slow-stirring method in accordance with the OECD 123 guideline, which appears to be more suitable. With this method, it was shown that the weighted average value of the 1-octanol/water partition coefficient log10 Pow of the substance is equal to 4.729 ± 0.027 at 25 ± 1 °C. The result issued from the statistical calculations can be given as 4.73.
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