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Ecotoxicological information

Toxicity to terrestrial plants

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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. 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 hexafluorotitanate resulting in a NOEC of 190.6 mg/kg.

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for terrestrial plants:
190.6 mg/kg soil dw

Additional 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 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).