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Ecotoxicological information

Toxicity to aquatic plants other than algae

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Description of key information

The effect of the test item was evaluated in a 7 day growth inhibition test using the aquatic plant Lemna gibba (duckweed). The EC50 based on growth rate of dry weight was determined to be 10.7 mg/L (nominal concentration).

Key value for chemical safety assessment

EC50 for freshwater plants:
10.7 mg/L

Additional information

The effect of the test item was evaluated in a 7 day growth inhibition test using the aquatic plant Lemna gibba (duckweed). The test was performed according to OECD guideline 221. Following a preliminary non-GLP range-finding test with concentrations 0 (control), 1.00, 10.0 and 100 mg/L a static main test with concentrations of 0 (control), 0.320, 1.00, 3.20, 10.0, 32.0 and 100 was performed. The concentrations in the main test were verified analytically. Since the measured concentrations of the test substance in the test solutions were within ± 20% of the nominal concentrations, the effect concentration can be expressed relative to the nominal concentration for the evaluation of the test substance. Increase of frond numbers, dry weight, growth rate of frond numbers and growth rate of dry weight, yield of frond numbers and yield of dry weight were the parameters for assessment of toxic effects. The EC50 based on growth rate of dry weight was determined to be 10.7 mg/L (nominal concentration).