Registration Dossier
Registration Dossier
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EC number: 431-920-4 | CAS number: -
Partition coefficient
Administrative data
Link to relevant study record(s)
Description of key information
The partition coefficient calculated by EpiSuite for Vat Indigo Potassium Salt is Log Kow(version 1.67 estimate): -1.10
The partition coefficient for the oxidised, environmentally stable form Indigo is Log Kow: 2.7
Key value for chemical safety assessment
- Log Kow (Log Pow):
- -1.1
Additional information
The test substance is synthesized and handled as an aqueous potassium 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 potassium salt is hence not possible.
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
The partition coefficient calculated by EpiSuite for Vat Indigo Potassium Salt is the following:
Log Kow(version 1.67 estimate): -1.10
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