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Physical & Chemical properties

Partition coefficient

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Description of key information

The log Pow of the substance should be stated as a range of 6.85 – 24.17, based on the calculated log Pow values of the individual components.

Key value for chemical safety assessment

Log Kow (Log Pow):
15.2

Additional information

During pre-tests for the determination of the log POW of the substance using the HPLC method according to OECD 117 resp. EU A.8 it became obvious that the solubility of the test item was not sufficient for evaluation. The following solubility values were obtained with the tested solvents:

•            Methanol: < 1 g/L

            Acetonitrile: < 1 g/L

            Isopropanol: < 1 g/L

•            Tetrahydrofuran: > 2 g/L

After addition of water, at least parts of the dissolved material precipitated. As the solubility of different components usually differs, this finding aroused doubts if the dissolved material is representative for the test item.

Therefore a calculation of the log Pow based on the known and expected components of the test item was recommended by the study director.

LogPow value for the substance was calculated with a widely used QSAR model developed by EPA, KOWWIN v. 1.68.

Each individual component of this UVCB substance has been evaluated separately.

The predicted partition coefficient is in the range 6.85 -24.17, based on the calculated log Pow values of the individual components.

Each component falls within the applicability domain of the model, thus all predictions can be considered of high reliability.

Key value indicated is the mean value between the eight Log Pow values of components.