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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Red disazo condensation pigments are with high probability not harmful to aquatic algae. 
No toxic effects occur at the range of the substances solubility.
EC50 (72h) and EC10 (72h) >= 1 mg/L (nominal) for growth rate of Desmodesmus subspicatus (OECD 201)

Key value for chemical safety assessment

Additional information

The toxicity on aquatic algae was investigated for two ‘red disazo condensation pigments’(CAS 68516-75-6 and CAS 71566-54-6) [DR.U.NOACK-LABORATORIEN, 2012; BASF SE 2012]. The studies were conducted with the green algae species Desmodesmus subspicatus (CAS 68516-75-6) and Pseudokirchneriella subcapitata (CAS 71566-54-6). Based on the low water solubility of the test item, saturated stock solutions were prepared and the tests were conducted as limit tests with nominal concentrations of 1 mg/L (CAS 68516-75-6) and 10 mg/L (CAS 71566-54-6), respectively. After 72 hours of exposure no toxic effects on algae observed, neither in the study with Desmodesmus subspicatus nor in the study with Pseudokirchneriella subcapitata.