Registration Dossier
Registration Dossier
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EC number: 208-915-9 | CAS number: 546-93-0
Endpoint summary
Administrative data
Description of key information
Additional information
Magnesium carbonate is an inorganic substance and therefore does not undergo hydrolysis or biodegradation. In the environment, magnesium carbonate will dissociate into magnesium and carbonate ions. These ions are naturally ubiquitous in the environment; magnesium will be assimilated by species present in the water, soil or sediment and is necessary to maintain a good chemical balance in the environment and carbonate will become part of the carbon cycle.
Furthermore, magnesium and carbonate ions are essential to all living organisms (flora and fauna) and their intracellular and extra-cellular concentrations are actively regulated. Therefore, bioaccumulation is not expected.
Soil, sediment and water degradation studies can not be performed due to the absence of an analytical test method that could distinguish between contributions to the analysed solution magnesium concentration originating from the test material and that originating from the soils or sediments themselves. Moreover, in the environment, magnesium carbonate will dissociate into simple magnesium and carbonate ions.
Magnesium carbonate presents only limited solubility in water and solubility characteristics are known to be sensitive to both solution pH and also the presence/partial pressure of carbon dioxide (which dissolves to give carbonate or bicarbonate ions). Therefore, changes with respect to aqueous phase pH and dissolved carbon dioxide concentrations on exposure to soils and sediments may lead to shifts in the relative solubility of the test material and potential precipitation and sedimentation on centrifugation of the samples; a process which can not be separated analytically from any true adsorption onto the soil or sediment phases.
The organic carbon content of the soil and sediment is not anticipated to play a significant role in the mobility of simple inorganic salts such as magnesium carbonate and therefore the actual test endpoint, that of an organic carbon normalised adsorption coefficient (Koc) is probably not actually valid/ relevant for this type of substance. For the magnesium content at least, pH, water potential and carbon dioxide partial pressure amongst others will be controlling factors.Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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