Registration Dossier
Registration Dossier
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EC number: 231-179-5 | CAS number: 7440-70-2
Endpoint summary
Administrative data
Description of key information
- In accordance with REACH Annex XI.2 testing of elemental Ca is technically not possible, and
- In accordance with REACH Annex XI.3 and Column 2 adaptation statements testing is not necessary as direct or indirect exposure of elemental Ca or relevant Ca compounds to aquatic compartment is unlikely to occur (see exposure assessment in CSR Chapter 9)
Aquatic toxicity endpoints are not considered applicable for elemental calcium (Ca) because
(1) Aquatic testing of elemental Ca is not technically feasible based on the existing data on Ca reactivity in water.
(2) Also, because Ca is not found in its elemental state in nature, the decision which environmental endpoints are relevant is based on the exposure and the bioavailability considerations of Ca in its whole life-cycle. Elemental Ca is used in iron, steel and alloy manufacturing processes. The life cycle of Ca metal in these processes ends with reaction on use; therefore there is no exposure to Ca (metal form) after it is introduced into the furnace. CaO is formed as a result of the use of Ca metal in the steel and alloy processes. Also, no Ca-reactions with water to form Ca(OH)2 happen in these processes.
In the above applications the exposure of Ca into aquatic compartment is unlikely. In addition, the chemical safety assessment indicates that the level of concern for environment is low and risks are controlled.See supporting information in CSR Chapter 9 and 10.
Semi-quantitative risk characterisation was applied to freshwater and marine water sediment. For this purpose, PNEC values of Ca(OH)2 were applied. See further information in CSR Chapter 10.
Freshwater: 48h-EC50 value for the immobility of Daphnia magna= 49.1 mg Ca(OH)2 /L (Egeler et al., 2007)
- PNEC aqua (freshwater): 0.49 mg/L, assessment factor 100, justification: lowest L(E)C50 value: 49.1 mg Ca(OH)2/L for immobilisation of Daphnia magna
Salt water: 14 d-NOEC value for the mortality of Crangon septemspinosa= 32 mg Ca(OH)2 /L (Locke et al., 2008)
- PNEC aqua (marine water): 0.32 mg/L, assessment factor 100, justification: lowest NOEC value: 32 mg Ca(OH)2/L for mortality of Crangon septemspinosa.
Additional information
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