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Physical & Chemical properties

Partition coefficient

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Description of key information

The partition coefficient of the substances in the category ranges from 1.09 to 2.89.

Key value for chemical safety assessment

Log Kow (Log Pow):
2.52
at the temperature of:
20 °C

Additional information

Data from Hansch (1995) were available for the substances methane, ethane, propane, butane and isobutane. Data from the CRC handbook (Lide 2008) were available for isobutane. The information is taken from reliable peer reviewed handbooks and so can be considered reliable and suitable for use for this endpoint. QSAR estimate data are also available for methane, ethane, propane, butane and isobutane.

The partition coefficient of methane is 1.09, ethane is 1.81, propane is 2.36, butane is 2.89 and isobutane is 2.76. The mean of the partition coefficient values for the category is 2.52 and this has been used to complete the 'key value for chemical safety assessment'.