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Physical & Chemical properties

Partition coefficient

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Description of key information

The partition coefficient of the substance was determined to be -0.13, -0.13 and 2.39 at 20°C using the estimation method n-octanol/distilled water, n-octanol/buffer solutions and n-octanol/critical micelle concentration respectively (Brekelmans MJC, 2012).

Key value for chemical safety assessment

Log Kow (Log Pow):
2.39
at the temperature of:
20 °C

Additional information

A guideline compliant study was conducted to calculate the partition coefficient of the test substance using the quotient of the n-octanol solubility and the water solubility.

The n-octanol solubility of the substance as the sum of the solubilities of C8-TMAC, C10-TMAC, C12-TMAC, C14-TMAC, C16-TMAC, C18-TMAC and C18:1-TMAC was 243 g/L (determined at 20.4±0.6°C). The solubility of the substance in distilled water and in buffer solutions was 328 g/L (determined at 20.0°C) and the critical micelle concentration was 1 g/L (determined at 20.0 ± 0.1°C). The partition coefficient of the substance was determined to be -0.13, -0.13 and 2.39 at 20°C using the estimation method n-octanol/distilled water, n-octanol/buffer solutions and n-octanol/critical micelle concentration respectively (Brekelmans MJC, 2012).