Registration Dossier

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

From comparison of similar dyes, the intense colour may inhibit photosynthetic growth at high concentrations, but there is no evidence of biological effects. 

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L

Additional information

From assessment of similar sulphonated azo substances, it is concludes that CJ302 need not be classified as hazardous to aquatic organisms on the basis of effects to aquatic plants. Although some references show an inhibition of growth rates biomass at concentrations below 100 mg/l, it is considered very likely that this is mainly due to absorption of light at wavelengths liked to photosynthesis.

 

No convincing evidence has been found that the substance causes harm to aquatic plants, other than shading from the coloured material.  

 

The read-across is valid and is backed up by review documents, including an assessment of azo dyes by the Danish EPA that conclude low environmental toxicity to aquatic organisms.