Registration Dossier

Diss Factsheets

Physical & Chemical properties

Partition coefficient

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The partition coefficient was derived from literature and QSAR values of the constituents and the main impurities of the substance.
The partition coefficient of terpinolene multiconstituent is stated to be 3.7 at 20°C.

Key value for chemical safety assessment

Log Kow (Log Pow):
3.7
at the temperature of:
20 °C

Additional information

In a weight of evidence approach, literature data and QSAR values were gathered for the constituents and the main impurities of terpinolene multiconstituent representing 80% of the substance.

The composition of the substance was taken into account and log Kow of terpinolene multiconstituent was derived using a ponderate mean based on constituent/impurity contribution. The result is used as key value for chemical assessment.

Constituent/Impurity  Distribution %*  log Kow  Constituent contribution**
 terpinolene***  37.5  4.33  1.624
 1,4 -cineole  25  2.84  0.71
 1,8 -cineole  17.5  2.84  0.497
 l-limonene  10  4.35  0.435
 d-limonene  10  4.35 0.435 
 terpinolene multiconstituent  100    3,7

* Sum of the five molecules considered as 100%

** Constituent contribution = predicted log Kow x % of the substance

** Several data were available for terpinolene monoconstituent; the value included in the above table is the arithmetic mean of the gathered values.

Another way to present the results is to list the relative presence of the chemical structures with a given log Kow range:

log Kow range % of constituent/impurity
log Kow < 3  42.5
3 ≤ log Kow < 4.5  57.5
4.5 ≤ log Kow < 6   -
6 ≤ log Kow < 8   -
8 ≤ log Kow   -

Categories Display