Registration Dossier

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Abiotic degradation

The substance is expected to hydrolyse slowly under normalenvironmental conditions. Experimental studies on hydrolytic effects demonstrated that the substance does undergo hydrolysis at environmentally relevant pH’s, with a half life of 15.6 days at pH 7. As such, degradation is anticipated via this route. Studies on direct phototransformation in water are not available but it is assumed on thebasis of chemical structure and nature of use that the substance is not degraded by direct photolysis. It is concluded, therefore, that abiotic processes would contribute significantly to the depletion of the substance within the environment.

Biotic degradation

The substance, by nature of it being a reactive dye is not deemed to be biodegradable. By read across to a structural analogue, Reactive Yellow FD 08064 displays a low ready biodegradability in that it achieved 5% biodegradation in a 28-day study closed bottle test . This indicates that it is unlikely to achieve a half life of less than 40 or 60 days within fresh water attributed to ready biodegradation alone.