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Partition coefficient

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Reference
Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
21.02.- 22.02.2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.8 (Partition Coefficient - Shake Flask Method)
Version / remarks:
Council regulation (EC) No 440/2008
Deviations:
yes
Remarks:
See Any other information
Qualifier:
according to
Guideline:
OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)
Version / remarks:
Adopted 27 July 1995
Deviations:
yes
Remarks:
See Any other information
GLP compliance:
yes (incl. certificate)
Type of method:
flask method
Partition coefficient type:
octanol-water
Analytical method:
high-performance liquid chromatography
Key result
Type:
log Pow
Partition coefficient:
-2.36
Temp.:
23 °C
pH:
6.4

A stock solution of the test substance should be prepared in n-octanol pre-saturated with water. Because of a low solubility of the test substance in this medium, the stock solution was prepared in water pre-saturated with n-octanol.

This deviation has no effect on the determination of log Pow of the test substance. There were no other deviations from study plan or guidelines during the study.

Conclusions:
Partition coefficient (log P) of the test substance, Direct Blue 85, determined by shake-flask method is:log Pow = -2.36 ± 0.02 (pH 6.4, 23°C)
Executive summary:

The partition coefficient of the test substance Direct Blue 85 was determined.

For determination of partition coefficient was used the shake-flask method.

The test was performed according to the shake-flask method (OECD Test Guideline 107, Partition Coefficient (n-octanol/water): Shake Flask Method, Adopted 27 July 1995).

Partition coefficient (log P) of the test substance Direct Blue 85 determined by shake-flask method is:

log Pow = -2.36 ± 0.02 (pH 6.4, 23°C)  

Description of key information

The partition coefficient of the test substance Direct Blue 85 was determined. The test was performed according to the shake-flask method (OECD Test Guideline 107, Partition Coefficient (n-octanol/water): Shake Flask Method, Adopted 27 July 1995).

log Pow = -2.36 ± 0.02 (pH 6.4, 23°C)

Key value for chemical safety assessment

Log Kow (Log Pow):
-2.36
at the temperature of:
23 °C

Additional information