Registration Dossier

Administrative data

Endpoint:
partition coefficient
Type of information:
calculation (if not (Q)SAR)
Remarks:
Migrated phrase: 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.

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2011
Report Date:
2011

Materials and methods

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

Test material

Reference
Name:
Unnamed
Type:
Constituent

Study design

Analytical method:
photometric method

Results and discussion

Partition coefficientopen allclose all
Type:
Pow
Partition coefficient:
1.26
Temp.:
22 °C
pH:
ca. 7
Type:
log Pow
Partition coefficient:
0.1
Temp.:
22 °C
pH:
ca. 7

Any other information on results incl. tables

The octanol and the water solubility were both determined at 22 -23 °C.

It is not possible to enter a temperature range in the field above, therefore 22 °C was taken as the temperature value.

Calculation:

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

(c: individual solubilities; see below).

 

PY 120

Octanol solubility [µg/L]

 240.0

Water solubility [µg/L]

190.0

POW

1.26

log POW

0.10

Applicant's summary and conclusion

Conclusions:
The calculated log Pow of the test substance is 0.10.
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 0.10.