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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:
From 20 August 2002 to 30 August 2002
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions
Qualifier:
according to
Guideline:
OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)
Version / remarks:
July 1995
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
flask method
Partition coefficient type:
octanol-water
Analytical method:
gas chromatography
Key result
Type:
log Pow
Partition coefficient:
> 2.22 - < 2.26
Temp.:
25.3 °C
pH:
> 6.2 - < 6.4
Remarks on result:
other:
Remarks:
Average value
Type:
log Pow
Partition coefficient:
2.26
Temp.:
25.3 °C
pH:
> 6.3 - < 6.4
Remarks on result:
other:
Remarks:
average value for condition 1
Type:
log Pow
Partition coefficient:
2.24
Temp.:
25.3 °C
pH:
> 6.3 - < 6.4
Remarks on result:
other:
Remarks:
average value for condition 2
Type:
log Pow
Partition coefficient:
2.22
Temp.:
25.3 °C
pH:
> 6.2 - < 6.3
Remarks on result:
other:
Remarks:
average value for condition 3

Calculation of partition coefficient:

The partition coefficient of the test item was calculated by the use of the concentration of the test item in the water layer and 1-octanol layer according to the following equation:

Log Pow = Co /Cw

Co is the concentration of test item in 1-octanol layer (mg/l)

Cw is the concentration of test item in water layer (mg/l)

The total average of Log Pow is 2.24 with a standard deviation of 0.021 and a maximum difference of 0.05.

Conclusions:
The logarithm of partition coefficient is 2.24 at 25°C and pH between 6.2 to 6.4.
Executive summary:

The partition coefficient of the test item was determined according to a recognised guideline (OECD 107). No deviation from the guideline was observed during the study.

The test item concentration in each phase ( 1-octanol saturated with water and water saturated with 1-octanol) has been determined by gas chromatography with FID detection.

The logarithm of partition coefficient is equal to 2.24 at 25°C and the pH is measured between 6.2 to 6.4.

Description of key information

The partition coefficient of the test item was determined in an experimental study performed according to a recognised guideline (OECD 107).

Key value for chemical safety assessment

Log Kow (Log Pow):
2.24
at the temperature of:
25 °C

Additional information

The pH of the aqueous phase during this study was between 6.2 to 6.4