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EC number: 276-012-7 | CAS number: 71786-55-5
Toxicity to aquatic plants other than algae
Administrative data
Link to relevant study record(s)
Description of key information
ErC50 > 100 mg/l, nominal concentration
Key value for chemical safety assessment
Additional information
No studies on the "toxicity to aquatic plants" are available on the target substance. For this reason data on an anlogue substance (Similar Substance 01) was taken into account. More details about the similarities between the two substances is reported in section 13.
A semi-static main test with nominal concentrations of 0 (control), 0.298, 0.954, 3.05, 9.77, 31.3 and 100 mg/L was performed. Vegetative growth was observed for a test period of 7 days by measuring the increase of frond numbers and dry weight. The following endpoints (NOEC/LOEC, EC10, 20, 50) were determined:
- frond numbers and dry weight
- growth rates of frond numbers and dry weight
- yield of frond numbers and dry weight
- doubling times of frond number
The initial mean measured concentration of the test item solutions was 111 % of nominal. The overall mean concentration of fresh and aged samples was 112 % of nominal. Toxicological endpoints were evaluated using nominal concentrations of the test item.
Significant inhibitory effects were determined for all parameters at all test item concentrations (0.298 to 100 mg/L nominal). The overall LOEC was therefore determined to be 0.298 mg/L, the corresponding NOEC could not be observed and is supposed to be below 0.298 mg/L.
The nominal EC10-value was determined to be 0.0252 mg/L for yield of dry weight, 32.3 mg/L for growth rate of dry weight, 0.189 mg/L for yield of frond numbers and 17.4 mg/L for growth rate of frond numbers.
The nominal EC20-value was determined to be >100 mg/L for growth rate of frond numbers and dry weight, 3.03 mg/L for yield of frond numbers and 1.11 mg/L for yield of dry weight.
The nominal EC50-value for yield of dry weight, growth rate of dry weight, yield of frond numbers and growth rate of frond numbers was determined to be >100 mg/L.
The test is valid as the doubling time of control frond numbers was calculated to be 33.2 h, corresponding to 1.385 days at day 7. This is less than the maximum allowable doubling time set in OECD guideline 221 (60 h, 2.5 days).
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