Registration Dossier
Registration Dossier
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EC number: 276-123-0 | CAS number: 71873-46-6
Toxicity to aquatic plants other than algae
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 (7d): 11.29 mg/l (geom. mean), based on frond number
Key value for chemical safety assessment
Additional information
The phytotoxicity of the test item on the freshwater aquatic plant Lemna gibba was assessed in accordance with method and procedures outlined into the OECD guideline 221.
In the main test, exponentially growing cultures of Lemna gibba were exposed to nominal concentrations 5.0, 10.0, 20.0, 40.0, 80.0 and 160 mg/l of the test item, over a period of 7 days in a static system under defined conditions.
The measured concentrations deviated more than 20 % from the nominal during the experiment in each concentration, therefore, biological results are based on the geometric mean of the measured test item concentrations.
The average specific growth rate, as well as yield, was statistically significantly different from the control group at the concentrations of 1.29, 2.54, 5.49, 10.97, 23.69 and 32.70 mg/l, based on on frond number, dry and fresh weight.
NOEr/yC (7d): < 1.29 mg/l, based on frond number, dry and fresh weight
LOEr/yC (7d): 1.29 mg/l, based on frond number, dry and fresh weight
ErC50 (7d): 11.29 mg/l (95 % confidence limits: 9.211 – 14.089 mg/l), based on frond number
ErC50 (7d): 7.47 mg/l (95 % confidence limits: 6.058 – 9.212 mg/l), based on dry weight
ErC50 (7d): 8.61 mg/l (95 % confidence limits: 7.468 – 9.956 mg/l), based on fresh weight
EyC50 (7d): 4.68 mg/l (95 % confidence limits: 4.025 – 5.383 mg/l), based on frond number
EyC50 (7d): 3.06 mg/l (95 % confidence limits: 2.535 – 3.605 mg/l), based on dry weight
EyC50 (7d): 3.57 mg/l (95 % confidence limits: 3.228 – 3.924 mg/l), based on fresh weight
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