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Ecotoxicological information

Toxicity to microorganisms

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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. Therefore, full read-across of microbial toxicity data of potassium fluoride (CAS #7789-23-3) and other fluorides based upon a molecular weight conversion is justified (see below). The lowest available NOEC of 7.1 mg F/L for toxicity of fluoride to Uronema parduszi results in a NOEC for microbial toxicity of 15.0 mg/L dipotassium hexafluorotitanate.

Key value for chemical safety assessment

EC10 or NOEC for microorganisms:
15 mg/L

Additional information

Dipotassium hexafluorotitanate

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 microbial toxicity data of potassium fluoride (CAS #7789-23-3) and other fluorides based upon a molecular weight conversion is justified (see below). The lowest available NOEC of 7.1 mg F/L for tresults in a NOEC for microbial toxicity of 15.0 mg/L dipotassium hexafluorotitanate.

Potassium fluoride

The guideline-compliant Bayer study reports a 3 -hour NOEC of 510 mg/L for activated sludge. The EU RAR summarises and reviews the other available data on the toxicity of fluoride to aquatic microorganisms; NOEC values of between 7.1 - 226 mg/L are reported.