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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:
124.8 mg/L
EC10 or NOEC for freshwater algae:
31.25

Additional information

The toxicity of 2 -ethyl-4 -methylimidazole (CAS 931-36-2) was tested in a growth inhibition test according to the German Industrial Standard DIN 38412, Part 9. The test species was Desmodesmus subspicatus. The test item was studied in two separate assays with either pH-adjusted or not pH-adjusted test solutions. The 72 -h ErC50 was determined to be 124.8 mg/L if the test solutions were not pH-adjusted (nominal; BASF AG 1990; Study no. 2/0245/89). The test item concentrations were not analytically verified, but are assumed to be stable.