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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The  toxicity of the structural analogue dipotassium hexafluorotitanate to algae (Pseudokirchneriella subcapitata) was tested according to OECD 201; respective EC 10 and EC50 values were recalculated and result in 0.89 mg/L and 7.38 mg/L dihydrogen hexafluorotitanate.

Key value for chemical safety assessment

EC50 for freshwater algae:
7.38 mg/L
EC10 or NOEC for freshwater algae:
0.89 mg/L

Additional information

Dihydrogen hexafluorotitanate

The toxicity of the structural analogue dipotassium hexafluorotitanate to algae (Pseudokirchneriella subcapitata) was tested according to OECD 201; respective EC 10 and EC50 values were recalculated and result in 0.89 mg/L and 7.38 mg/L dihydrogen hexafluorotitanate 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.