Registration Dossier
Registration Dossier
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EC number: 458-930-1 | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The 72 hour EC50 for growth rate and biomass for algae exposed to Ceraphyl 55 was greater than the highest concentration tested, 0.036 mg/L. The 72 hour NOEC was found to be 0.036 mg/L.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 0.036 mg/L
- EC10 or NOEC for freshwater algae:
- 0.036 mg/L
Additional information
The toxicity of Ceraphyl 55 to algae was determined in a GLP-compliant, static growth inhibition study following OECD guideline 201 (Springborn Smithers 2004). Pseudokirchneriella subcapitata were exposed to Ceraphyl 55 for 72 hours at mean measured concentrations of 0.0017, 0.0039, 0.013, 0.023, 0.036 mg/L and observations of cell counts were made daily. As no concentration resulted in ≥50 % inhibition of the total biomass or the growth rate, an EC50 could not be determined but no additional testing has been undertaken as the highested nominal concentration tested approximated the water solubility limit of Ceraphyl 55 in the test media.
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