Registration Dossier
Registration Dossier
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EC number: 943-210-6 | CAS number: -
Toxicity to aquatic plants other than algae
Administrative data
Link to relevant study record(s)
Description of key information
ErC50(frond number) = 123 mg/l
Key value for chemical safety assessment
- EC50 for freshwater plants:
- 123 mg/L
- EC10 or NOEC for freshwater plants:
- 8.99 mg/L
Additional information
The inhibitory effects of test item to the duckweed Lemna minor were investigated over a period of 7 days, based on the frond number and biomass (dry weight), following the OECD guideline 221.
The test item is a well soluble powder (47370 mg/l in water). The test was performed at 400, 200, 100, 50 and 25 mg/l nominal concentration.
Three parallel test vessels were used for each test concentration of the test item and six vessels for the blank controls.
The test concentrations during the 7 -day test period were determined by photometry at the beginning of the test, as well as after 2, 5 and 7 days of exposure.
The two endpoints frond number and biomass (dry weight) were investigated at days 2, 5 and 7, and each of them were assessed as growth rate and yield.
The results of the toxicity assessment to the duckweed Lemna minor are summarized in the following table showing ECxvalues based on the geometric mean of the measured concentrations:
| Parameter expressed as measured concentration (mg/l) | EC50 | EC10 | NOEC |
| Frond number, Growth Rate | 123 | 9.2 | 8.99 |
| Frond number, Yield | 24.8 | n.d | 8.99 |
| Dry weight, Growth Rate | 61.7 | n.d | < 8.99 |
| Dry weight, Yield | 12.3 | n.d | < 8.99 |
The 7 day ErC50 (based on frond number) of test item on the duckweed Lemna minor is 123 mg/l. This value is based on the measured concentrations of the substance.
The validity criterion was fulfilled.
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