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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:
04.12.91 - 23.05.92
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.8 (Partition Coefficient - HPLC Method)
Deviations:
no
GLP compliance:
no
Type of method:
HPLC method
Partition coefficient type:
octanol-water
Analytical method:
gas chromatography
Key result
Type:
log Pow
Partition coefficient:
4.38
Temp.:
25 °C
pH:
ca. 6.5

Determined concentrations in the n-octanol phase

Sample No

Concentration in mg/mL

1

2.410

2

2.447

3

2.406

4

2.436

5

2.400

6

2.442

Determined concentrations in the aqueos phase

Sample no

Concentration in mg/mL

1

<0.0001

2

<0.0001

3

<0.0001

4

<0.0001

5

<0.0001

6

<0.0001

Calculation

Sample No

Mass/mg

Mass determined/mg

%

CO/CW=P

Log P

1

57.372

<57.841

100.82

>24100

5.3829

2

57.372

<58.729

102.37

>24470

4.3886

3

43.029

<43.310

100.65

>24060

4.3813

4

43.029

<43.850

101.91

>24360

4.3867

5

28.686

<28.802

100.40

>24000

4.3802

6

28.686

<29.306

102 .16

>24420

4.3877

Mean: >24235 Log mean 4.3845

Conclusions:
The partition coefficient n-octanol/water of the test item was determined according to the flask method. It was found to be: log Pow > 4.3845
Executive summary:

A study was conducted in accordance with EU method A.8 to determine the partition coefficient of the test substance using the shake flask method. The partition coefficient POWis defined as the ratio of the equilibrium concentrations of a dissolved test item in the two-phase system consisting of n-octanol and water. The partition coefficient POWis dimensionless and usually given in the form of its logarithm to base ten. The partition coefficient (n-octanol/water) of the test item was determined at room temperature to be: log POW= 4.3845

Description of key information

The partition coefficient (n-octanol/water) of the test item was determined according to the shake flask method the partition coefficient was determined at room temperature. It was found to be: log POW= 4.3845

Key value for chemical safety assessment

Log Kow (Log Pow):
4.385
at the temperature of:
20 °C

Additional information

A study was conducted in accordance with EU method A.8 to determine the partition coefficient of the test substance using the shake flask method. The partition coefficient POWis defined as the ratio of the equilibrium concentrations of a dissolved test item in the two-phase system consisting of n-octanol and water. The partition coefficient POWis dimensionless and usually given in the form of its logarithm to base ten. The partition coefficient (n-octanol/water) of the test item was determined at room temperature to be: log POW= 4.3845