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Physical & Chemical properties

Partition coefficient

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Description of key information

The partition coefficient of HCN is -0.25 at 20 °C.

Key value for chemical safety assessment

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

Additional information

According to Regulation (EC) No.1907/2006, Annex XI, Section 2, the testing regime may be adapted because testing is technically not feasible as a consequence of the properties of the substance.  The dry salt of cyanide has no partition coefficient, as it is no longer in the form of a salt when it is placed in water under normal conditions. Rather, the salt is converted to hydrogen cyanide, which has a partition coefficient of -0.25 at 20 °C.