Registration Dossier
Registration Dossier
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EC number: 231-954-8 | CAS number: 7782-41-4
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The toxicity of fluorine to algae is derived from experimental data with its degradation product fluoride.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 43 mg/L
- EC50 for marine water algae:
- 81 mg/L
- EC10 or NOEC for freshwater algae:
- 50 mg/L
- EC10 or NOEC for marine water algae:
- 50 mg/L
Additional information
No aquatic toxicity studies with fluorine are available or can be performed as in contact with water fluorine reacts instantly and violently under formation of hydrogen fluoride. Hydrogen fluoride will further react to fluoride. Therefore available data from studies with fluoride are given as indication of the aquatic toxicity of fluorine.
In the EU Risk Assessment Report for hydrogen fluoride two studies with freshwater alga are reported (EU-RAR, 2001). Both studies were performed with sodium fluoride and the results corrected for the fluoride ion. Although data on test conditions are not available, as the data have been reviewed by the EU, these data are considered to be suitably reliable for environmental risk assessment. The lowest effect-value was observed in Scenedesmus sp. with a 96-h EC50 for biomass of 43 mg fluoride/L. For marine algae the EC50-value is 81 mg fluoride/L in Skeletonema costatum. NOEC values of 50-249 mg/L and 50-200 mg/L are reported for freshwater and marine algae, respectively.
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