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EC number: 402-770-7 | CAS number: 92585-24-5 PAMPLEFLEUR
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
An acute toxicity study was conducted on the test material Pamplefleur the results of the study showed the test material produced an EC50 value of 20 mg/L for growth rate. The No Observed Effect Concentration (NOEC) was 10 mg/L for growth rate
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 20 mg/L
- EC10 or NOEC for freshwater algae:
- 10 mg/L
Additional information
Analysis of the test preparations at 0 hours showed measured test concentrations to range from 92% to 100% of nominal. A concentration dependant decline in measured test concentrations was observed at 72 hours in the range of 28% of nominal at 0.10 mg/l through to 90% of nominal at 32 mg/l. As a concentration dependant decline in measured test concentrations was observed during the range-finding test it was considered likely that the test item was adsorbing to the algal cells present. As such, in order to demonstrate this, additional test samples were prepared at 0 hours with the omission of algal cells. These additional samples were incubated alongside the test and sent for analysis at 72 hours. Analysis of these samples showed measured test concentrations in the range of 81% to 98% of nominal were obtained thereby confirming that the decline observed in the samples containing algal cells was due to adsorption of the test item to the algal cells present rather than instability.
As such it was considered that the algal cells were exposed to near nominal test concentrations throughout the duration of the test. Therefore the results are based on nominal test concentrations only. The measured concentartions fit within the range 80 to 120% of the nominal concentrations, which means the results can be based only upon the nominal concentrations.
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