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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Physical & Chemical properties

Partition coefficient

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Administrative data

Link to relevant study record(s)

partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Basic data given in a peer reviewed journal (also assessed by OECD)
no guideline followed
Principles of method if other than guideline:
Two different concentrations were prepared in 100 ml of 1-octanol and shaken with 500 ml of purified water
GLP compliance:
not specified
Type of method:
shake-flask method to: flask method
Partition coefficient type:
Analytical method:
gas chromatography
log Pow
Partition coefficient:
20 °C
Remarks on result:
other: pH not reported

PH not determined

The log Pow of TPP was measured as 4.63.
Executive summary:

The log Pow of TPP was measured as 4.63.

Description of key information

The partition coefficient for TPP between octanol and water has been measured experimentally and determined as Log Kow = 4.6 at ambient temperature.

Key value for chemical safety assessment

Log Kow (Log Pow):
at the temperature of:
20 °C

Additional information

Log Pow values between 4.5 and 4.7 are reported in various reputable sources. The value of 4.63 was determined by Saeger et al (1979) and a virtually identical value was obtained by Mayer et al using the same method