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Physical & Chemical properties

Partition coefficient

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Description of key information

Partition coefficient calculated:
Log Kow(version 1.67 estimate): -1.10

Key value for chemical safety assessment

Log Kow (Log Pow):
-1.1

Additional information

The test substance is synthesized and handled as an aqueous sodium hydroxide solution (pH 13) only under inert gas atmosphere. It is instable in an aqueous phase at neutral pH or as solid material on air and oxidises rapidly to indigo CAS 482-89-3. The determination of the partition coefficient of indigo vat sodium salt is hence not possible.

The calculated log Pow for Vat Indigo sodium salt is: Log Kow(version 1.67 estimate): -1.10

The data on indigo is as follows:

Determined experimentally from solubilities: log Pow >1.4 at 23°C

Determined experimentally by HPLC: log Pow 2.7 at 23°C

Calculated by KOWWIN: 3.11

Experimental KOWWIN: 3.72