Registration Dossier
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EC number: 232-452-1 | CAS number: 8031-44-5
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 (72 h) > 100 mg/l (loading rate or above its solubility in test medium)
NOErC (72 h) = 100 mg/l (loading rate)
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 100 mg/L
- EC10 or NOEC for freshwater algae:
- 100 mg/L
Additional information
The growth inhibitory effects of the substance to the green alga Desmodesmus subspicatus were investigated in a static, limit test according to the guideline OECD 201 and EU Method C.3, over a period of 72 h. The algae were exposed to only one loading rate of 100 mg/; the test solution was prepared through 96-h stirring followed by filtration. Six parallel test vessels were used for the test item and six for the blank controls. The concentrations of the substance in the media were determined by DOC analysis at the beginning and after 24, 48 h and 72 h of exposure. These analyses confirmed the very low solubility of the test item as all test concentrations were below the limit of quantification. The effective concentrations ErCx/EyCx were assessed based on the loading rates of the test item.
Based on the growth rate, 11 % inhibition were observed at 100 mg/l loading rate, as compared to the blank controls.
With respect to the endpoint yield (algal biomass), 37 % inhibition was observed at 100 mg/l loading rate, as compared to the blank controls.
ErC50, EyC50 (72h)> 100 mg/l (loading rate or above it solubility in test medium)
NOECr, NOECy(72h)>100 mg/l (loading rate or above it solubility in test medium)
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