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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Hydrolysis product: 2-Ethylhexanoic acid: Acutely harmful to aquatic algae.
Hydrolysis product: HCl: Acutely very toxic to aquatic algae.

Key value for chemical safety assessment

EC50 for freshwater algae:
44.4 mg/L

Additional information

No data on the toxicity of 2 -ethylhexanoyl chloride is available. However, since the test substance rapidly hydrolyses in water, algae are mainly exposed to the hydrolysis product 2 -ethylhexanoic acid.

The toxicity of 2 -ethylhexanoic acid to algae is assessed via a study according to German Industrial Standards DIN 38412 L9. The test species was Desmodesmus subspicatus (reported as Scenedesmus subspicatus). The 96-h ErC50 of 44 mg/L indicates that 2 -ethylhexanoic acid is acutely harmful to aquatic algae (BASF AG, 1989; Report No. BASF2/0949/88).

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).