Registration Dossier
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EC number: 617-219-8 | CAS number: 81334-34-1
Toxicity to aquatic plants other than algae
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.
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