Registration Dossier
Registration Dossier
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EC number: 291-793-4 | CAS number: 90480-58-3
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Octanoic acid, zinc salt, basic:
Acute toxicity to freshwater algae (standard test): lowest EL50: 0.16 mg/L (dissolved fraction after 7 days in accordance with OECD Series # 29) in standard test medium (Pseudokirchneriella subcapitata)
Chronic toxicity to freshwater algae (standard test): lowest EL10: 0.02 mg/L (dissolved fraction after 7 days in accordance with OECD Series # 29) in standard test medium (Pseudokirchneriella subcapitata)
In the assessment of environmental toxicity of octanoic acid, zinc salt, basic, read-across to the assessment entities soluble zinc substances and octanoic acid is applied since zinc cations and octanoate anions determine its fate and toxicity in the environment.
Octanoic acid:
The lowest ErC50 and NOEC of 15 and 1.9 mg/L, respectively, for the growth inhibition of freshwater algae were observed for the effect of decanoic acid (C10) in a reliable, GLP-conform growth inhibition test with Pseudokirchneriella subcapitata conducted according to OECD 201.
Zinc:
Acute toxicity to freshwater algae: lowest IC50: 0.136 mg Zn/l (Selenastrum capricornutum; single value) (neutral/high pH)
Chronic toxicity to freshwater algae: lowest NOEC: 0.019 mg Zn/l (Pseudokirchneriella subcapitata =Selenastrum capricornutum; geomean of 27 data)
Chronic toxicity to marine algae: 12 species available which NOECs range between 0.0078 and 0.67 mg/l (dissolved concentrations)
Respective NOEC/EC10 values were applied in the species sensitivity distribution.
Key value for chemical safety assessment
Additional information
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