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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

Since dipotassium hexafluorotitanate rapidly dissociates into fluoride, potassium and titanium ions upon dissolution in the environment, and only fluoride but not titanium ions will remain in solution, it can be assumed that toxicity (if any) will be driven by the fluoride anion. Therefore, full read-across of chronic toxicity data for fish of potassium fluoride (CAS #7789-23-3) and other fluorides based upon a molecular weight conversion is justified. The LC5 of 4 mg F/L derived for Oncoryhychus mykiss in a 21-d test with sodium fluoride (LC5 = 4 mg F/L ), results in an LC5 of 8.4 mg/L dipotassium hexafluorotitanate. 

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater fish:
8.4 mg/L

Additional information

Dipotassium hexafluorotitanate

Since dipotassium hexafluorotitanate rapidly dissociates into fluoride, potassium and titanium ions upon dissolution in the environment, and only fluoride but not titanium ions will remain in solution, it can be assumed that toxicity (if any) will be driven by the fluoride anion. Therefore, full read-across of chronic toxicity data for fish of potassium fluoride (CAS #7789-23-3) and other fluorides based upon a molecular weight conversion is justified (see below).

Potassium fluoride

In a 21 day test with Oncorhynchus mykiss, an LC5 value of 4 mg F/L was reported (actual concentration). This value is considered to be equivalent to the NOEC for mortality. The test was conducted in very soft (12 mg CaCO3/L) natural water with daily renewal of the test water.