Registration Dossier
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EC number: - | CAS number: 42355-78-2
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 (72h) > 120 mg/l (nominal)
NOEC (growth rate, 72h) = 120 mg/l (nominal)
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 120 mg/L
- EC10 or NOEC for freshwater algae:
- 120 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. 266/2016/Method C.3. The aim of the study was the determination of the effects on growth rate and yield over a period of 72 hours.
The study was conducted under static conditions with an initial cell density of 5416 cells/ml. A stock solution with a nominal concentration of 120 mg test item/l was freshly prepared with dilution water. Five concentrations were tested in a geometrical series with a factor of √10: 1.20 - 3.79 - 12.0 - 37.9 - 120 mg/l. Three replicates were tested for each test item concentration and six replicates for the control. The environmental conditions were within the acceptable limits. The concentrations of the test item were determined at the start of the exposure (0 hours) and at the end of the exposure (72 hours) of all tested concentration levels and the control via HPLC-DAD. The measured concentrations of the test item were in the range of 96 to 101 % of the nominal values at the start of the exposure (0 hours) and 102 to 111 % of the nominal values at the end of the exposure (72 hours).
ErC50 (72h) > 120 mg/l (nominal)
NOEC (growth rate, 72h) = 120 mg/l (nominal)
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