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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:
2007-08-21 to 2007-11-22
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 117 (Partition Coefficient (n-octanol / water), HPLC Method)
Deviations:
no
Remarks:
The testing facility indicated that the protocol was followed without deviation.
Qualifier:
according to
Guideline:
EU Method A.8 (Partition Coefficient)
Deviations:
no
Remarks:
The testing facility indicated that the protocol was followed without deviation.
GLP compliance:
yes (incl. certificate)
Remarks:
Federal Office of Environment, Water Management and Supervision of Trade
Type of method:
HPLC method
Partition coefficient type:
octanol-water
Specific details on test material used for the study:
- Identity: TIC876 (T002675)
- Batch: 603T-1
- Purity: 97.76%
- Expiration date: December 19, 2007
- Storage: at room temperature (about 20°C)
Analytical method:
high-performance liquid chromatography
Type:
log Pow
Partition coefficient:
1.055
pH:
5
Remarks on result:
other: The nominal temp of the HPLC system was 22.0°C with 5.0°C and 85.0°C as lower and upper limit respectively
Details on results:
Using the correlation log K/ log Pow, the log Pow of the test item T002675 was calculated as 1.055 ± 0.004.

Table 2. Test Substance Calculated Values

Measurement  K log K

 log Pow

Measurement 1  0.5513  -0.259

 1.051

Measurement 2  0.5559  -0.255

 1.058

Measurement 3   0.5549  -0.256

 1.057

Mean    

 1.055

Standard Deviation     

 0.004

Conclusions:
The log Pow of the test substance was found to be 1.055 ± 0.004 at pH 5.

Description of key information

The log Pow of the substance was determined according to the OECD Guideline 117 and the EU Method A.8 and was estimated to be 1.055 at pH 5 (K1, Paulus, 2007). 

Key value for chemical safety assessment

Log Kow (Log Pow):
1.055

Additional information

The HPLC method was used to determine the partition coefficient of the substance. Using the correlation log K/ log Pow and based on the mean of three measurements, the log Pow of the test item T002675 was calculated as 1.0055 ± 0.004.