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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The IC50 of quinidine is between 200 µM (64.88 mg/L) and 400 µM (129.77 mg/L). At a concentration of 400 µM (129.77 mg/L) the maximal effect was obtained and the quantum efficiency is close to 0. At a concentration of 200 µM quinidine the quantum use efficiency is reduced but still above 50% of the control.

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Additional information

The toxicity to cyanobacterium Arthrospira maxima was determined with a quantum efficiency test. The IC50 is between 200 µM and 400 µM quinidine. At a concentration of 400 µM (129.77 mg/L) the maximal effect was obtained and the quantum efficiency is close to 0. At a concentration of 200 µM quinidine the quantum use efficiency is reduced but still above 50% of the control. Thus, the IC50 is > 200 µM (64.88 mg/L). The effect was determined over time. For 200 µM quinidine the maximal effect was observed after 6 hours exposure.