Registration Dossier
Registration Dossier
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EC number: 910-697-1 | CAS number: -
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
No studies on plant toxicity are available on the reaction mass of CaF2, CaSO4 and CaCO3. Instead information on the 3 constituents is available.
The EU RAR (2001) reports NOEC values from 106 to 3000 mg/kg of fluoride (equivalent to 218-6116.5 mg/kg for CaF2). The 63 day experiments were carried out in a micro-ecosystem containing poplar litter (30% o.m) and the isopod Porcellio scaber. Nitrification was found to be the most sensitive endpoint investigated in the micro-ecosystem test.
The effect of the calcium carbonate on the nitrogen transformation activity of soil microorganisms has been investigated over a 28-day period in an OECD 216 study. The outcome was an EC50 value of greater than 1000 mg/kg. Correspondingly the NOEC was 1000 mg/kg.
No studies are available on the effect of CaSO4 on soil microorganisms. Given the extensive and continued use of calcium sulfate as a fertiliser and for chemical treatments of soils and its natural occurrence in the environment, it is considered that calcium sulfate would not have a detrimental effect on soil microorganisms.
On the basis of the information available for the 3 constituents, a low toxicity of the reaction mass of calcium fluoride and calcium sulfate and calcium carbonate is expected on soil organisms.
On the basis of the available NOEC for CaF2, the NOEC value for the reaction mass can be concluded: 436 mg RM/kg dw soil. This value is calculated by taking into account that the reaction mass contains only 50% of CaF2 (ca. 47.5 w/w % CaF2) and that the additional of Ca2+ through CaSO4 and CaCO3 would even further reduce the toxicity of CaF2 as free F- will be complexed.
Key value for chemical safety assessment
- Long-term EC10 or NOEC for soil microorganisms:
- 436 mg/kg soil dw
Additional information
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