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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

In a limit test Desmodesmus subspicatus was exposed under static conditions to a concentration of  100 mg/l (pH 7.9-9.0). After 72 h no toxic effects against algae were observed at a limit test concentration of 100 mg/L, corresponding to a measured concentration of < 0.0176 mg/L, which reflects the maximum water solubility under exposure conditions. 

Key value for chemical safety assessment

EC50 for freshwater algae:
100 mg/L
EC10 or NOEC for freshwater algae:
100 mg/L

Additional information

"should read EC50> 100 mg/L, NOEC >= 100 mg/L"

This endpoint was covered by read-across of a study of 1,4-bis[(2-ethyl-6-methylphenyl)amino]anthraquinone. This read-across is justified as both substances have very similar chemical structures, the main physicochemical parameters (vapour pressure, water solubility and dissociation constant) are in the same range and further all available toxicological studies for both substances revealed the same results. Therefore a read-across for other physicochemical, ecotoxicological or toxicological endpoints seems to be justified. More details about the read-across justification are displayed in a detailed document attached to the Annex of the CSR.