Registration Dossier
Registration Dossier
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EC number: 241-034-8 | CAS number: 16961-83-4
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 1.8 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.9 mg/L
- Assessment factor:
- 20
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 64.24 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 36.6 mg/kg sediment dw
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 7.32 mg/kg sediment dw
- Assessment factor:
- 50
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 2.85 mg/kg soil dw
- Assessment factor:
- 10
- Extrapolation method:
- sensitivity distribution
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
The environmental toxicity of hexafluorosilicic acid is driven by fluoride, which is liberated following the dissociation of the substance in water. Other components (silicates) are unlikely to have any adverse effects in the environment, while effects on pH are unlikley to occur at relevant exposure levels. Read-across to other water-souble inorganic fluoride conpounds is therefore appropriate and PNECs are derived based on the extensive database for fluoride compounds. The concentrations were calculated for hexafluorosilicic acid.
Conclusion on classification
For aquatic ecotoxicity no classification is proposed.
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