Registration Dossier
Registration Dossier
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EC number: 234-666-0 | CAS number: 12021-95-3
Toxicity to soil macroorganisms except arthropods
Administrative data
Link to relevant study record(s)
Description of key information
Since dihydrogen hexafluorozirconate rapidly dissociates into fluoride, hydrogen and zirconium ions upon dissolution in the environment, and only fluoride but not hydrogen and zirconium ions will remain as such in solution, it can be assumed that toxicity (if any) will be driven by the fluoride anion. Therefore, the NOEC of 1200 mg F/kg for the long-term (154 days) toxicity (growth, maturity and hatchability of coccons) of sodium fluoride to Eisenia fetida (according to OECD 207) is read-across resulting in a NOEC of 2181.6 mg/kg for dihydrogen hexafluorozirconate.
Key value for chemical safety assessment
- Long-term EC10, LC10 or NOEC for soil macroorganisms:
- 2 181.6 mg/kg soil dw
Additional information
Dihydrogen hexafluorozirconate
Since dihydrogen hexafluorozirconate rapidly dissociates into fluoride, potassium and zirconium ions upon dissolution in the environment, and only fluoride but not hydrogen and zirconium ions will remain as such in solution,it can be assumed that toxicity (if any) will be driven by the fluoride anion. Therefore, full read-across of soil 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 toxicity of various fluoride compounds to Eisenia fetida was investiated over a period of 22 weeks. At higher concentrations sodium fluoride, potassium fluoride and the sodium salt of fluoroacetic acid reduced significantly. Calcium fluoride had no effect. The rate of maturity of the earthworms was also significantly reduced when sodium fluoride and potassium fluoride was used. The number of hatchlings was reduced in the presence of sodium fluoride, while the number of cocoons was reduced in the presence of a low concentration of sodium fluoride and potasium fluoride (Vogel & Ottow, 1992).
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