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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

These results suggest that the pH of the test media, increased by the presence of the test substance, was partially responsible for the toxicity observed in the non-adjusted media.

Key value for chemical safety assessment

EC50 for freshwater algae:
69.3 mg/L

Additional information

After 72 hours of exposure to MODA, in non-adjusted media the EbC50 and ErC50, were 22.0 and 34.4 mg/L respectively. In pH-adjusted media, the EbC50 and ErC50, were 69.3 and >100 mg/L respectively. The “no observed effect concentration” (NOEC) for the area under the growth curve and for growth rate in non-adjusted media were 0.82 and 1.84 mg/L respectively and in pH-adjusted media both were 22.0 mg/L.

After 72 hours of exposure to MODA in an alga growth inhibition test, in non-adjusted media the EbC50 and ErC50, were 22.0 and 34.4 mg/L respectively. In pH-adjusted media, the EbC50 and ErC50, were 69.3 and >100 mg/L respectively. The NOEC for the area under the growth curve and for growth rate in non-adjusted media were 0.82 and 1.84 mg/L respectively and in pH-adjusted media both were 22.0 mg/L.

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