Registration Dossier
Registration Dossier
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EC number: 210-036-0 | CAS number: 603-35-0
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
The partition coefficient of the substance is 5.02 at 25 °C.Key value for chemical safety assessment
- Log Kow (Log Pow):
- 5.02
- at the temperature of:
- 25 °C
Additional information
A GLP study was conducted in accordance with the OECD Guideline for the Testing of Chemicals 123, slow stirring method . The study results that the slow stirring method is not suitable for the determination of the octanol/water coefficient for compounds like triphenylphosphine ( triphenylphosphine (TPP) decomposes in water to form triphenylphosphine oxide) which are unstable in one of the layers for the time needed to reach Partition equilibrium (BASF AG, 2003). Handbook data (Hansch et al., 1995, cited in Physprop database; exploring QSAR data equivalent to OECD 123) reveal a log Kow of 5.69. This value has been used in terms of chemical safety assessment. In addition, a supporting model calculation was done with KOWWIN v1.68 (EpiSuite v4.11; BASF SE, 2018) estimating the partition coefficient of TPP to be 5.021 at 25 °C.
Handbook data (Hansch et al., 1995, cited in Physprop database; exploring QSAR data equivalent to OECD 123) reveal a log Kow of 2.83 for triphenylphosphine oxide.
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