Registration Dossier
Registration Dossier
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EC number: 269-616-7 | CAS number: 68307-94-8
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
The partition coefficients of the test item have been determined and are shown below:
Mean Log10 Pow: 3.15 to 4.51 (Mean area %: 17.4)
Mean Log10 Pow: >6.5 (Mean area %: 82.6)
Key value for chemical safety assessment
- Log Kow (Log Pow):
- 6.5
- at the temperature of:
- 30 °C
Additional information
The partition coefficients of the test item have been determined using the HPLC method, designed to be compatible with Method A8 Partition Coefficient of Commission Regulation (EC) No 440/2008 of 30 May 2008 and Method 117 of the OECD Guidelines for Testing of Chemicals, 13 April 2004. The results are shown in the following table:
Mean Area % |
Mean Log10Pow |
Mean Partition Coefficient |
17.4 |
3.15 to 4.51 |
1.43 x 103to 3.27 x 104 |
82.6 |
>6.5 |
>3.16 x 106 |
The method guideline states that the measurement of partition coefficient should be carried out on substances in their unionised form. However, the dissociation constants of certain functional groups found in the test item made it impossible to satisfy this criterion (see Dissociation Constant). Testing would be required at approximately pH 1.5 or below for the acidic functional groups to be in the unionised form. Therefore, as pH 1.5 or below is outside the environmental pH range for this test and also experimentally impractical, testing was carried out at approximately neutral pH with the functional groups ionised.
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