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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

The substance is used in fertiliser preparations for application to various plant species.  Toxicity to terrestrial plants is therefore likely to be low. Nevertheless at elevated concentrations toxicity effects might be observed when using NaF (and probably also CaF2).

Key value for chemical safety assessment

Short-term EC50 or LC50 for terrestrial plants:
264 mg/kg soil dw

Additional information

Acute toxicity and uptake of fluoride, administered as NaF, in willow trees (Salix viminalis) when exposed to F in soil or hydroponic solution were determined experimentally. There was a clear dose-response relationship for the inhibition of transpiration (indicator for lethal effects): EC10, EC20 and EC50 values at 96h were respectively 38, 59.6 and 128 mg F/L. In the soil test, the soil with the highest dissolvable (bio-available) fluoride, caused a significant and high inhibition of transpiration and growth of willows.

The acute toxicity of fluoride in a root elongation test with seeds of cress (Lepidium sativum) gave EC10, EC20 and EC50 values at 72h of 61.4, 105 and 262.8 mg F/L.

Based on these 3 experiments, it is concluded that fluoride contaminated soils may inhibit growht and transpiration of planted trees. A similar conlcusion can be drawn for CaF2.