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Physical & Chemical properties

Partition coefficient

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Description of key information

The partition coefficient n-octanol / water (Kow) of decamethylenediamine was determined according to OECD guideline no. 117 [2004] and EU test method A.8 [2008] with the HPLC method. The result was partition coefficient n-octanol / water (Kow) at 25 °C and pH 7.5: Kow = 1.995 / log Kow = 0.3.

Key value for chemical safety assessment

Log Kow (Log Pow):
0.3
at the temperature of:
25 °C

Additional information

The study reflects the properties of the partially dissociated molecule. Measurement of undissociated decamethylenediamine would have required a pH value too high to be tolerated by the HPLC column. Therefore the pH was adjusted to 7.5 with a buffer as recommended in OECD TG 117. As dissociation leads to increased concentrations in the aqueous phase, a higher log Kow has to be expected for the undissociated molecule. However, this higher log Kow would not reflect the behaviour in the environment where approximately neutral pH values prevail.