Registration Dossier
Registration Dossier
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EC number: 910-697-1 | CAS number: -
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
No studies have been conducted on the reaction mass of CaF2, CaSO4 and CaCO3. Instead information is available on the 3 different constituents.
No toxicity is expected for CaSO4 . Calcium sulfate, calcium and sulfate ions are ubiquitous in the environment. Calcium is an important constituent of most soils and the minerals found in soil are mostly compounds of calcium with other substances. Furthermore, calcium sulfate, as gypsum, is used as an inorganic fertiliser to improve soil quality.
Similarly, no toxicity is expected from CaCO3. Sediments naturally contain a high concentration of calcium and carbonate due to the physical and/or chemical weathering of calcium-rich rocks that takes place in the environment. The precipitation and deposition of calcium carbonate, usually as calcite, is a widely observed phenomenon in hard water lakes.
Pearcy et al. (2015) assessed the toxicity of NaF to sediment organisms Hyalella azteca and larval Chironomid dilutus. The IC10 (growth) concentrations (converted to CaF2 based on molecular weight) were: Hyalella azteca: 3.7 to 10.68 mg/L CaF2 (increasing IC10 with increasing on Cl concentration); Chironomid dilutus: < 8.42 mg/L CaF2. The LC50 value (converted to CaF2) were:Hyalella: 9.86 - 26.5 mg/L CaF2 and Chironomid: 112.56 mg/L CaF2. The key values could not be expressed in mg/kg sediment.
On the basis of the available IC10 for CaF2, the worst-case IC10 value for the reaction mass can be concluded: 7.4 mg RM/L. Similarly, the LC50 value for the reaction mass can be calculated as 19.72 mg RM/L. 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
Additional information
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