Registration Dossier

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Description of key information

The study does not need to be conducted as the substance has an extremely low octanol water partition coefficient (log Kow < 0).

Key value for chemical safety assessment

Koc at 20 °C:
30

Additional information

The study does not need to be conducted because the substance has a low octanol water partition coefficient (log Kow <3 and even <0) and the adsorption potential of this substance is related to this parameter. The substance carries sulphonate groups, and is thus anionic. Similar reactive dyes which also carry sulphonate groups, and also having an extremely low log Kow and a very high water solubility showed low Koc values (Koc < 30) in appropriate experiments, indicating that such dyes are very mobile and that the majority will stay in the water phase rather than adsorbing to soil or sludge. For the chemical safety assessment a Koc value of 30 is anticipated.