Registration Dossier
Registration Dossier
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EC number: 240-985-6 | CAS number: 16923-95-8
Toxicity to terrestrial plants
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. The NOEC of 90.49 mg F/kg derived for the decrease in biomass of onion (Allium cepa) followed by a 90-d exposure to sodium fluoride in soil was read-across to dipotassium hexafluorozirconate resulting in a NOEC of 225 mg/kg.
Key value for chemical safety assessment
- Long-term EC10, LC10 or NOEC for terrestrial plants:
- 225 mg/kg soil dw
Additional 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 soil toxicity data of potassium fluoride (CAS #7789-23-3) and other fluorides based upon a molecular weight conversion is justified. However, limited reliable data are available to determine the critical value for plant toxicity of fluoride in soil. According to Jha et al. (2009), visible symptoms of F toxicity in terms of tip burning and death of onion (Allium cepa) were noticed in highly contaminated soils (>400 mg NaF/kg soil) after 90 days, and the NOEC (added) for the decrease in biomass was found to be 200 mg NaF/kg (90.49 mg F/kg).
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