Registration Dossier

Diss Factsheets

Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

Currently viewing:

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.

Categories Display