Registration Dossier
Registration Dossier
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EC number: 262-679-1 | CAS number: 61260-55-7
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Acutely harmful to aquatic organisms (LC50=75.7 mg/L).
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 75.7 mg/L
- EC10 or NOEC for freshwater algae:
- 9.4 mg/L
Additional information
The toxicity of the substance to Desmodesmus subspicatus was tested using a static test system set up according to Directive 87/302/EEC C.3 under GLP conditions. At test termination after 72 hours of exposure an ErC50 of >75.7 mg/L was determined (Ciba-Geigy 1993, amendment 2006). The test was conducted with the measured concentrations of 0.7 to 75.7 mg/L (5 concentrations), a NOECr of 9.4 mg/L was calculated for 72 hours.
In a supporting study conducted according to 92/96/EEC under GLP conditions, nominal concentrations of 4.6 to 140 mg/L of the test substance were tested, with a second test range of 0.6 to 2.3 mg/L, both with differing sensitivity ranges. A static system with Desmodesmus subspicatus was used, with a resulting EC10 (72h) of 51 mg/L (Study director 1993f).
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