Registration Dossier
Registration Dossier
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EC number: 203-891-6 | CAS number: 111-64-8
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Hydrolysis product: Octanoic acid: With high probability acutely not harmful to aquatic algae.
Hydrolysis product: HCl: Acutely very toxic to aquatic algae.
Key value for chemical safety assessment
Additional information
No data on the toxicity of octanoyl chloride is available. However, since the test substance rapidly hydrolyses in water, algae are mainly exposed to the hydrolysis product octanoic acid.
The toxicity of octanoic acid to algae is assessed via a study with a marine diatom (Nitzschia closterium). The 72 -h EC50 of 144 mg/L indicates that octanoic acid is not harmful to aquatic algae (Mann & Florence, 1987).
The hydrolysis product hydrochloric acid (HCl) was tested in an algae growth inhibition test according to OECD 201 with Pseudokirchneriella subcapitata. The 72-h ErC50 was 0.492 mg/L (acid equivalent to pH 5.3), the 72 -h NOEC was 0.097 (acid equivalent to pH 6; OECD 2002).
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