Registration Dossier
Registration Dossier
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EC number: 207-439-9 | CAS number: 471-34-1
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
Description of key information
No studies are available; however, aquatic bioaccumulation is not expected to occur.
Key value for chemical safety assessment
Additional information
Calcium carbonate is an inorganic ionic solid for which an octanol/water partition coefficient cannot be reliably determined. Calcium carbonate dissociates into the calcium Ca2+and carbonate CO32-ions at environmental pH. These are essential to all living organisms (flora and fauna) and their intracellular and extra-cellular concentrations are actively regulated. Bioaccumulation is therefore not expected.
New research has shown that calcium carbonate is produced by bony fish. These fish continuously drink seawater to avoid dehydration. This exposes them to an excess of ingested calcium, which they precipitate into calcium carbonate crystals in the gut. The fish then simply excrete these unwanted chalky solids, sometimes called 'gut rocks', in a process that is separate from digestion and production of faeces.
Furthermore, mollusc shells are primarily composed of calcium carbonate.
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