Registration Dossier
Registration Dossier
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EC number: 234-666-0 | CAS number: 12021-95-3
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
The toxicity of dihydrogen hexafluorozirconate to algae (Pseudokirchneriella subcapitata) was tested according to OECD 201; respective EC 10 and EC50 values were recalculated for dihydrogen hexafluorozirconate and amount to 1.19 mg/L and 7.79 mg/L.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 7.79 mg/L
- EC10 or NOEC for freshwater algae:
- 1.19 mg/L
Additional information
Dihydrogen hexafluorozirconate
The toxicity of the structural analogue dipotassium hexafluorozirconate to algae (Pseudokirchneriella subcapitata) was tested according to OECD 201; respective EC10 and EC50 values were recalculated for dihydrogen hexafluorozirconate and amount to 1.19 mg/L and 7.79 mg/L indicating a similar potential for acute toxicity to aquatic invertebrates (or a lack thereof) as other fluoride substances (see below).
Potassium fluoride
The EU RAR reviews and summarises the available data on the short-term toxicity of sodium fluoride to freshwater and marine algae species. The EC50 values for freshwater algae are reported to range from 43 to 122 mg/L (as fluoride ion, F-). For marine algae the EC50 was 81 mg F/L in a single study with Skeletonema costatum.
In long-term studies, NOEC values of 50 -249 mg F/L and 50 -200 mg F/L are reported for freshwater and marine algae, respectively.
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