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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Link to relevant study record(s)

Description of key information

Ethanol is sligtly toxic to the green algae Chlorella vulgaris.

Key value for chemical safety assessment

EC50 for freshwater algae:
275 mg/L
EC10 or NOEC for freshwater algae:
11.5 mg/L

Additional information

In a study (study record #2) which followed the basic principles of a guideline study, the green algae Chlorella vulgaris was exposed to ethanol at sufficient concentrations to enable an EC50 to be established. Exposure was carried out over 5 days with daily measurements of growth characterised by chlorophyll measurement. The dose response curve obtained was very shallow. The four day data presented showed some evidence that the control had passed the exponential growth phase. Basing the results on the 3 day measurements when exponential growth was still clearly evident, ethanol showed slight toxicity to this species. The results are shown below.


EC10 (72hr) = 11.5mg/l

EC50 (72hr) = 275mg/l