Registration Dossier
Registration Dossier
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EC number: 700-958-6 | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Acutely very toxic to aquatic algae.
Key value for chemical safety assessment
Additional information
Exponentially growing cultures of Scenedesmus subspicatus were exposed in a static test to different concentrations of the test item in ISO-medium for 72 hours according to OECD Guideline 201 (RCC Notox BV 1993h).
The measured test concentrations were 0.005, 0.01, 0.02, 0.05, 0.10, 0.22 and 0.46 mg/L based on analysis of samples taken at the start of the main test. During the exposure period the actual concentration remained > 80 % of the initial concentrations. The 72-hour EC50 for growth inhibition (EBC50: 0-72 h) was 0.061 mg/L with a 95 % confidence interval ranging from 0.024 to 0.133 mg/L. The 72 -hour EC50 for growth rate reduction (ERC50: 0-72 h) was 0.087 mg/L with a 95 % confidence interval ranging from 0.077 to 0.099 mg/L. The NOEC was 0.02 mg/L for both growth inhibition (NOEBC) and growth rate reduction (NOERC).
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