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EC number: 202-940-9 | CAS number: 101-41-7
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The toxicity of the test item to the unicellular freshwater green alga Pseudokirchneriella subcapitata was determined according to the principles of OECD 201 and Council Regulation (EC) No. 761/2009 C.3. The EC50-values for inhibition of growth rate (ErC50) and yield (EyC50) after 72 hours were 61.9 mg/L and 48.5 mg/L, respectively. The EC-10-values for inhibition of growth rate (ErC10) and yield (EyC10) after 72 hours were 47.4 mg/L and 36.0 mg/L, respectively. The NOEC-values for both inhibition of growth rate and yield after 72 hours were 31.6 mg/L, respectively.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 61.9 mg/L
- EC10 or NOEC for freshwater algae:
- 47.4 mg/L
Additional information
The toxicity of the test item to the unicellular freshwater green alga Pseudokirchneriella subcapitata was determined according to the principles of OECD 201 and Council Regulation (EC) No. 761/2009 C.3. The study was conducted under static conditions. The definitive test was carried out with five concentrations in a geometrical series with a dilution factor of 1.78: 10.0 -17.8 - 31.6 - 56.2 - 100 mg/L. In this study, the test item was found to inhibit the growth of the freshwater green alga Pseudokirchneriella subcapitata after 72 hours with the following effect values (based on nominal test item concentrations): The EC50-values with 95 % confidence intervals for inhibition of growth rate (ErC50) and yield (EyC50) after 72 hours were 61.9 (58.0 - 82.0) mg/L and 48.5 (39.8 - 52.4) mg/L, respectively. The EC-10-values with 95 % confidence intervals for inhibition of growth rate (ErC10) and yield (EyC10) after 72 hours were 47.4 (36.6 - 53.9) mg/L and 36.0 (28.8 - 47.8) mg/L, respectively. The NOEC-values for both inhibition of growth rate and yield after 72 hours were 31.6 mg/L, respectively.
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