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Partition coefficient

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Description of key information

Under the conditions of this study, a weighted average log Kow of 5.94 at neutral pH was reported for the test material.

Key value for chemical safety assessment

Log Kow (Log Pow):
5.94
at the temperature of:
24.5 °C

Additional information

The partition coefficient of the test material was determined in accordance with the standardised guideline OECD 117 under GLP conditions using the HPLC method. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The test material structure indicated that it was potentially ionisable and contained both cationic and anionic groups. There was no pH where the test material was neutral, so the test material was run at neutral (environmental) pH. The test material was dissolved directly into mobile phase (methanol: water (75:25)). Duplicate samples were prepared and each was analysed using HPLC. The log Kow of the test material was determined using a calibration curve constructed from 6 reference materials (plot of capacity factors against log Kow).

The test material was a mixture of compounds, which were expected to be related materials. These peaks were expected to display a similar detector response; therefore, a weighted average of the log Kow was calculated. HPLC peaks accounting for less than 5 % of the total peak area were not included in the calculations.

Under the conditions of this study the test material displayed a weighted average log Kow of 5.94 at neutral pH.

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