Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.9 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
51 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
11 mg/kg soil dw
Assessment factor:
10
Extrapolation method:
sensitivity distribution

Hazard for predators

Additional information

General approach to addressing the data requirements and read-across

The substance (sodium fluoride) is soild at room temperature and pressure, therefore the large majority of the ecotoxicological studies presented were performed on an aqeous solution of the substance, on hydrofluoric acid or other water-souble inorganic fluoride salts such as potassium fluoride. In this dossier, sodium fluoride was the most tested substance.

Sodium fluoride will rapidly and extensively dissociate in the environmnet to form its constituent ions: sodium and fluoride. The toxicity of the sodium ion is considered very low compared to the fluoride ion. The fluoride ion is of relatively higher toxicity and therefore it can be predicted that the effects of exposure to the substance at relevant concentrations will be due to the contribution of the fluoride ion. Water-soluble inorganic salts of fluoride will similarly exist in the aqueous environment as their constituent ions, and their toxicity at relevant concentrations and for non-toxic cations will be due to the contribution of fluoride. This is the case for sodium fluoride (water solubility 41300 mg/L) or potassium fluoride (920000 mg/L). It is noted that this read-across approach was also taken for the 2001 EU Risk Assessment Report for hydrogen fluoride.

Hence, in the following section, the discussion will focus on the ecotoxicological effects of the fluoride ions in various compartments.

Conclusion on classification

Sodium fluoride is not classified for environmental effects according to the CLP Regulation (EC) 1272/2008.