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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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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 geometric mean of two NOEC values (3.7 mg F/L, 14.1 mg F/L) of 7.2 mg F/L derived in two reproductive studies of sodium fluoride with Daphnia magna results in a NOEC of 15.2 mg/l dipotassium hexafluorotitanate.

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater invertebrates:
15.2 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 invertebrates of potassium fluoride (CAS #7789-23-3) and other fluorides based upon a molecular weight conversion is justified (see below).

Potassium fluoride

The EU RAR summarises the effects of two reproductive studies of sodium fluoride on Daphnia magna. The two studies report NOEC values of 3.7 and 14.1 mg F/L, with an arithmetic mean of 8.9 mg F/L. The ICD reports additional EC50 values in the range of 10 - 48 mg F/L.