Registration Dossier
Registration Dossier
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EC number: 807-702-3 | CAS number: 3225-26-1
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
4-Hydroxy TEMPO was tested for toxicity to algae in a 72 h-static test according to EU-method C.3 and OECD guideline 201. The EC50 based on growth rate was assessed at 1038 mg/L. The overall NOEC was determined at 22 mg/L.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 1 038 mg/L
- EC10 or NOEC for freshwater algae:
- 22 mg/L
Additional information
The toxicity of 4 -Hydroxy TEMPO to algae (Scenedesmus subspicatus) was investigated according to EU-method C.3 and OECD guideline 201. Algae were exposed to the test item for 72 hours. The following concentrations were tested 10, 22, 48, 100, 220, 480, 1000 mg/L. As measured concentrations did not deviate more than 20 %, results were based on nominal concentrations. The EC50, based on growth rate, was assessed at 1038 mg/L. The overall NOEC was determined at 22 mg/L.
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