Registration Dossier

Administrative data

Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Remarks:
Test procedure according to method of Analytical Expert Group ETAD (Ecological and Toxicological Association of Dyes and Organic Pigment Manufacturer)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2005
Report Date:
2005

Materials and methods

Test guideline
Qualifier:
according to
Guideline:
other: ETAD Analytical Expert Group
Version / remarks:
method for substances with very low solubilty in both water and n-octanol
Principles of method if other than guideline:
Determination of solubility in n-octanol and calculation of log Pow with water solubility reported in section 4.8
Type of method:
estimation method (solubility ratio)
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
Temp.:
24 °C
pH:
ca. 7
Type:
log Pow
Partition coefficient:
0.02
Temp.:
24 °C
pH:
ca. 7
Details on results:
Pow and log Pow were calculated from equilibrium concentrations in n-octanol (see below) and in water (see section 4.8)

Any other information on results incl. tables

The solubility in octanol was 8.5 µg/L at 24-25°C. This figure represents the mean of 5 determinations (range: 5.9 -11.59 µg/L, sigma = 2.19). The solubility in water was 8.1 µg/L (section 4.8)

These solubilities (equilibrium concentrations considering the tests performed) are used to calculate Pow with the following equation:

Pow = equilibrium concentration in octanol / equilibrium concentration in water

Pow = 8.5 µg/L / 8.1 µg/L

Pow = 1.0

log Pow = 0.02

Applicant's summary and conclusion

Conclusions:
The test substance has a log Pow of 0.02.
Executive summary:

The log Pow of the test substance was calculated from the equilibrium concentrations in water and in octanol. The log Pow at 24 °C (24 -25 °C for octanol, 23 -24 °C for water) was 0.02.