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Partition coefficient

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Reference
Endpoint:
partition coefficient
Type of information:
calculation (if not (Q)SAR)
Remarks:
estimated by calculation
Adequacy of study:
key study
Study period:
2011
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Acceptable method for pigments with low solubilities.
Principles of method if other than guideline:
Calculation of log Pow from solubility in octanol (see section 4.9) and water (see section 4.8).
Type of method:
other: Calculation
Partition coefficient type:
octanol-water
Analytical method:
photometric method
Type:
Pow
Partition coefficient:
6.35
Temp.:
25 °C
pH:
ca. 7
Type:
log Pow
Partition coefficient:
0.8
Temp.:
25 °C
pH:
ca. 7

The octanol and the water solubility were both determined at 25 -26 °C.

It is not possible to enter a temperature range in the field above, therefore 25 °C was taken as the temperature value.

Calculation:

log Kow = logP = log (c(n-octanol)/c(water))

(c: individual solubilities; see below).

 

PR185

Octanol solubility [µg/L]

 21.6

Water solubility [µg/L]

 3.4

POW

 6.35

log POW

 0.80
Conclusions:
The calculated log Pow of the test substance is 0.80.
Executive summary:

The partition coefficient of the test substance was estimated by calculation from the measured solubilities in water (see section 4.8) and n-octanol (see section 4.9). The calculated log Pow of the test substance is 0.80.

Description of key information

Key value for chemical safety assessment

Log Kow (Log Pow):
0.8
at the temperature of:
25 °C

Additional information

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