Registration Dossier
Registration Dossier
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EC number: 240-985-6 | CAS number: 16923-95-8
Toxicity to soil microorganisms
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, the lowest available NOEC of 106 mg F/kg for the long-term toxicity (63 days) of potassium fluoride to NO3-mineralisation (nitrification) is read-across to dipotassium hexafluorozirconate resulting in a NOEC of 263.5 mg/kg.
Key value for chemical safety assessment
- Long-term EC10 or NOEC for soil microorganisms:
- 263.5 mg/kg soil dw
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 soil microbial toxicity data 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 reports NOEC values from 106 to 3000 mg/kg. The 63 day experiments were carried out in a micro-ecosystem containing poplar litter (30% o.m) and the isopod Porcellio scaber Latr. Nitrification was found to be the most sensitive endpoint investigated in the micro-ecosystem test.
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