Registration Dossier
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EC number: 695-716-9 | CAS number: 1174931-74-8
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 (algae; growth rate) = >0.56 mg/l, 72 h, freshwater, OECD 201, Soucy 2012
NOEC (algae; growth rate) = 0.56 mg/l, 72 h, freshwater, OECD 201, Soucy 2012
Key value for chemical safety assessment
- EC10 or NOEC for freshwater algae:
- 0.56 mg/L
Additional information
The influence of the test material on the growth of the green algal species Pseudokircheriella subcapitata, was investigated in a 72 hour static test according to the OECD Guideline No. 201. The nominal test concentrations were 0.063, 0.13, 0.25, 0.5 and 1.0 mg/l in parallel with a control. Geometric mean measured concentrations ranged from 48 to 76% of nominal concentrations and defined the treatment levels tested as 0.043, 0.093, 0.19, 0.24 and 0.56 mg/L. The algal population grew well, resulting in an average of 595000 cells/mL in the control after 72 hours. No effects on algal health were noted during the test. Exposure of algae to the test material for 72 hours resulted in a median effective concentration EyC50 of >0.56 mg/l when determined using the number of cells/mL, and >0.56 mg/L when determined using the average specific growth rate. A NOEC value for growth rate and cell number was determined to be 0.56 mg/l.
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