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EC number: 910-697-1 | CAS number: -
Toxicity to terrestrial arthropods
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.
The effects of fluoride concentration were investigated on the numbers of Porcellio scaber in leaf litter. Leaf litter was collected from eight sites at various distances away from an aluminium reduction plant. Results showed that litter collected far from the plant had a lower fibre content, was more sapric and was less acid. Total acid extractable F- in the litter and upper 15 cm of soil was about 41 times as much at the closest site (700 mg/kg) as at the most distant sites (12 and 16 mg/kg). In a bioassay of litter from the study sites, woodlice (Porcellio scaber) had an abnormally high mortality in litter that contained 440 mg/kg or more of acid extractable F-. When F- was added in the form of NaF to the litter, a significant increase in mortality was observed only in treatments exceeding 800 mg/kg (Beyer et al, 1987) : a NOEC value (126d) of 800 mg/kg F- (equivalent to 1643 mg/kg of CaF2) was determined. CaF2 is hence not toxic to terrestrial arthropods.
No studies are available assessing the toxicity of CaCO3 and CaSO4 on terrestrial arthropods. Testing is not deemed necessary because calcium sulfate, calcium carbonate calcium, carbonate 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. No toxicity is expected to arise from the addition of CaCO3 and CaSO4 to soils.
On the basis of the available NOEC for CaF2, the NOEC value for the reaction mass can be concluded: 3286 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, LC10 or NOEC for soil dwelling arthropods:
- 3 286 mg/kg soil dw
Additional information
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