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Ecotoxicological information

Toxicity to terrestrial plants

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No studies on plant toxicity are available on the reaction mass of CaF2, CaSO4 and CaCO3. Instead information on the 3 constituents is available. 


Calcium fluoride is used in fertiliser preparations for application to various plant species. Toxicity of CaF2 applied during fertilisation is therefore not expected when applied as instructed. However, at elevated concentrations fluoride contamined soils may inhibit growth and transpiration of planted trees as demonstrated in a study by Clausen (2015) on willow trees. The test concentrations (mg/L) could however not be related to realistic soil application rates. 





The effect of CaCO3 on terrestrial plants has also been assessed in an OECD 208. The toxicity of calcium carbonate to three species of plant (soybean, tomato and oat) has been investigated and gave a 21 day EC50 of >1000 mg/kg dw soil based on both the seedling emergence and growth. Correspondingly the NOEC was 1000 mg/kg dw soil. This study showed that there were no toxic effects to plants at the concentration tested.


 


No testing is performed on CaSO4. Calcium sulfate, calcium and sulfate is ubiquitous in the environment. Toxicity to terrestrial plants is therefore likely to be low.


 


From the available information on the consitituents, it can be concluded that the reaction mass will not be toxic to terrestrial plants.

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