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Physical & Chemical properties

Partition coefficient

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Reference
Endpoint:
partition coefficient
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From March 2018 to May 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to other study
Qualifier:
according to guideline
Guideline:
OECD Guideline 107 (Partition Coefficient (n-octanol / water), Shake Flask Method)
Version / remarks:
July 1995
Deviations:
yes
Remarks:
The loaded concentration of the test was higher than 0.01 mol/L. This deviation doesn't impact the quality or the results of the study.
Qualifier:
according to guideline
Guideline:
EU Method A.8 (Partition Coefficient - Shake Flask Method)
Version / remarks:
May 2008
Deviations:
yes
Remarks:
The loaded concentration of the test was higher than 0.01 mol/L. This deviation doesn't impact the quality or the results of the study.
GLP compliance:
no
Type of method:
flask method
Partition coefficient type:
octanol-water
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: D653 22_02_2018
- Expiration date of the lot/batch: Feburary 2023
- Purity test date: 2018/02/27
Analytical method:
gas chromatography
Key result
Type:
log Pow
Partition coefficient:
2.03
Temp.:
20 °C
Remarks on result:
other: pH not measured
Details on results:
The test item concentration was higher than 0.01 mole/L, corresponding to 2.37 g/L. This concentration implied to be very close to the detection limit of 1,2-dichloro-1,1,2-trifluoro-2-(trifluoromethoxy)ethane, especially for the aqueous phase. In order to ensure a good quantification of the substance in both the media, the loaded concentrations were higher than the ones recommanded in the quidelines. The results were equivalent for all the tests. So it was concluded that the loaded concentration of the test item didn't impact the value of Log Pow

The n-octanol/water partition coefficient was calculated with the values obtained for the six assay. According to the guidelines, the six log POW should not differ of more than 0.3 units, therefore, the test item was considered as valid.

 Assay   Volumic ratio of water phase and octanol phase (Voctanol/ Vwater)  Log Pow
 Assay 1   1/1  2.05
 Assay 2   1/1

 1.87
 Assay 3   2/1  1.96
 Assay 4   2/1  2.00

 Assay 5

   1/2  2.15
 Assay 6   1/2   2.13
Conclusions:
The log partition coefficient of the test item at 20°C is 2.03
Executive summary:

The partition coefficient of the test item was determined with the shake flask method according to recognised guidelines. A deviation from the guidelines was observed but it didn't impact the quality or the results of the study.

The partition coefficient was determined in six assays. According to the Guidelines, the six log POW should not differ of more than 0.3 units, therefore, the test item was considered as valid.

The log partition coefficient of the test item at 20°C is 2.03.

Description of key information

The test item partition coefficient was experimentally determined in a GLP study performed according to OECD Guideline No. 107.

Key value for chemical safety assessment

Log Kow (Log Pow):
2.03
at the temperature of:
20 °C

Additional information