Registration Dossier
Registration Dossier
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EC number: 416-210-4 | CAS number: 128119-70-0
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
A study according to OECD 201 was performed to assess the inhibitory effect of Bornafix on the growth of the unicellular green alga Selenastrum capricornutum, Strain No. CCAP 278/4. Algal cultures exposed to 5 test concentrations of Bornafix plus one untreated control and one solvent control (100 µl auxiliary solvent per litre), were incubated on an orbital shaker under continuous illumination at 24°C for 72 hours. Growth was monitored daily by measuring the absorbance of each culture at 665 nm. All results are based on measured concentrations from 0 hour analysis because it is likely that the substance is at least partly adsorbing to algae and/or algae are interfering with the measurements of the substance. Measured concentrations varied from 40 - 69% of nominal at 0 hours and 12 - 40 % of nominal at 72 hours. The following values were derived from the data: ErC50 (24 - 48h) 11 mg/L and NOErC: 1.7 mg/L. The growth rate (EC50 and NOEC) between 24 - 48h hours is considered to be conservative because at shorter or longer exposure times the growth inhibition is less.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 11 mg/L
- EC10 or NOEC for freshwater algae:
- 1.7 mg/L
Additional information
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