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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Administrative data

Link to relevant study record(s)

Description of key information

72 hr ErC50 = 315 mg/L, 72 hr NOEC (growth rate) = 4.6 mg/L
72 hr EyC50 = 8 mg/L, 72 hr NOEC (yield) = 4.6 mg/L
(Desmodesmus subspicatus, strain CHODAT, OECD guideline 201, static, GLP, RL1)

Key value for chemical safety assessment

EC50 for freshwater algae:
315 mg/L
EC10 or NOEC for freshwater algae:
4.6 mg/L

Additional information

In a 72 hour acute toxicity study, the cultures of Desmodesmus subspicatus, strain CHODAT were exposed to Epoxy half acrylate (100% a.i.) at nominal concentrations of 0 (control), 1, 2.2, 4.6, 10, 22, 46, 100 mg/L under static conditions in accordance with OECD guideline 201. As the test item is poorly soluble in water, the water-accommodated fraction was tested. This was done by shaking the nominal load with the appropriate amount of deionised water for 24 hours, followed by membrane filtration.

At the beginning and at the end of the test, the content of test item was determined by DOC-determination in the test solutions. The content of the test item was calculated from the DOC measurement. Due to the low water solubility the correlation between nominal and measured concentration was very poor. Therefore, the nominal concentrations were used for the determination of the biological results.

The 72 h NOEC and 72 h EC50 based on growth rate were 4.6 and 315 mg/L. The 72 h NOEC and 72 h EC50 based on yield were 4.6 and 8 mg/L.