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Diss Factsheets

Ecotoxicological information

Toxicity to aquatic plants other than algae

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Administrative data

Link to relevant study record(s)

Description of key information

In a growth inhibition test, an EC25 of 0.013 mg/L and an EC50 of 0.024 mg/L was determined for Lemna gibba exposed to the test substance.

Key value for chemical safety assessment

EC50 for freshwater plants:
0.024 mg/L

Additional information

Key study (American Cyanamid Company, 981 -86 -176, 1987)

The toxicity of the test substance to Lemna gibba was determined in a growth inhibition test equivalent to OECD 221. The duckweeds were exposed over a 14-day period to five nominal test concentrations ranging from 0.01 to 0.1 mg/L of the test substance. Analysis of test substance was unsuccessful and the results are therefore based upon nominal concentrations. Biomass was determined by frond counts on day 2, 4, 7, 9, 11 and 14. Percent inhibition, relative to the control, was calculated for each concentration based upon the mean standing crop in number of fronds at fourteen days. Inhibition ranged from 15.1% to 95.0%. A 14-day EC25 and EC50 of 0.013 mg/L (95% confidence limits 0.009 - 0.019 mg/L) and 0.024 mg/L (95% confidence limits 0.016- 0.033 mg/L) were observed, respectively.