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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

With high probability acutely not harmful to aquatic algae.

Key value for chemical safety assessment

EC50 for freshwater algae:
202.5 mg/L
EC10 or NOEC for freshwater algae:
119.4 mg/L

Additional information

The acute toxicity of 1-methyl-1H-imidazole (CAS 616-47-7) on the aquatic green algae Desmodesmus subspicatus was investigated in a study conducted similar to OECD 201 (BASF AG, 1990; report no.: 2/204389/t72). The results were recalculated using ToxRatPro v2.10 (BASF SE, 2018). After 72 h, the ErC10 was found to be 119.4 mg/L based on nominal concentrations; the 72 -h ErC50 was determined to be 202.5 mg/L.


1-methyl-1H-imidazole (CAS 616-47-7) is considered to be with high probability acutely not harmful to aquatic algae.