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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:
2015-08-14 till 2015-08-20
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.8 (Partition Coefficient)
GLP compliance:
yes (incl. QA statement)
Remarks:
Chilworth Technology Limited, Phi House Southampton Science Park, Southampton SO16 7NS, United Kingdom
Type of method:
shake-flask method to: flask method
Partition coefficient type:
octanol-water
Analytical method:
high-performance liquid chromatography
Key result
Type:
log Pow
Partition coefficient:
3.9
Temp.:
20 °C
pH:
>= 8.45 - <= 9.14
Details on results:
See any other information on results incl. tables.

Analytical Determinations

Flask No.

1

2

3

4

5

6

Solvent Ratio

(O:W)

1:1

1:1

1:2

1:2

2:1

2:1

Volume of

Octanol (ml)

40

40

25

25

50

50

Volume of

water (ml)

40

40

50

50

25

25

Amount of

sample added

(g)

0.081

0.081

0.101

0.101

0.051

0.051

pH

(aqueous

phase)

9.14

9.04

8.84

8.80

 

8.62

8.45

Mean Peak

area (aqueous

phase)

4311.5

3905.5

1039.0

4340.5

3589.0

3607.5

Concentration

(g/L) (aqueous

phase

0.00026

0.00025

0.00015

0.00027

0.00024

0.00024

Dilution factor

1

1

1

1

1

1

Mean Peak

area (octanol

phase)

13839079.5

14205245.0

13967916.0

14381694.5

14094067.5

14381601.5

Concentration

(g/L) (Octanol phase)

1.86593

1.91529

1.88330

1.93907

1.90030

1.93906

 

Dilution factor

4

4

4

4

4

4

Log P

3.8481

3.8825

4.0862

3.8632

3.8979

3.9056

 

Conclusions:
The partition coefficient was determined to be 3.9.
Executive summary:

The log Pow of the test substance was tested according to EU method A8 and in compliance with GLP. Using HPLC the log Pow was determined to be 3.9.

Description of key information

The partition coefficient of the substance determined with HPLC is log 3.9 at 20°C

Key value for chemical safety assessment

Log Kow (Log Pow):
3.9
at the temperature of:
20 °C

Additional information

The partition coefficient of the test substance has been determined according to EU method A8 and in compliance with GLP using the shake flask method. Three flasks with solvent ratios 1:1; 1:2; 2:1 (O:W) were analyzed in duplicate with HPLC. The mean partition coefficient was determined to be 3.9 at 20°C.

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