Registration Dossier
Registration Dossier
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EC number: 240-985-6 | CAS number: 16923-95-8
Long-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
Since dipotassium hexafluorozirconate rapidly dissociates into fluoride, potassium and zirconium ions upon dissolution in the environment, and only fluoride but not zirconium 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 9.9 mg/L dipotassium hexafluorozirconate.
Key value for chemical safety assessment
Fresh water fish
Fresh water fish
- Effect concentration:
- 9.9 mg/L
Additional information
Dipotassium hexafluorozirconate
Since dipotassium hexafluorozirconate rapidly dissociates into fluoride, potassium and zirconium ions upon dissolution in the environment, and only fluoride but not zirconium 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.
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