Registration Dossier
Registration Dossier
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EC number: 908-343-6 | CAS number: -
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
An experimental determination of the adsorption/desorption potential of the reaction mass of calcium carbonate and calcium dihydroxide and calcium peroxide is not required due to the rapid hydrolysis and dissociation of the constituents present in this reaction mass. Instead, the behaviour of the degradation products is assessed based on available information.
Key value for chemical safety assessment
Additional information
As the reaction mass of calcium carbonate and calcium dihydroxide and calcium peroxide rapidly hydrolyses and dissociates in aqueous environment, the potential of the thus formed chemical species to adsorb to soil and sediment is examined:
· For hydrogen peroxide no remarkable adsorption to soil and sediment is expected based on its high polarity and water solubility. An estimated Koc value of 1.58 L/kg is available in the REACH registration dossier for hydrogen peroxide. Furthermore, Mackay Level 1 modelling indicates that the substance will partition into the aquatic compartment for > 99% at 20°C, and that negligible fractions will be found in the air, soil or sediment compartment.
· For the hydroxyl anions a Koc or Kd value is not relevant as the behaviour of this anion depends on the buffer capacity of the receiving environment.
· For the calcium cations measured Kd values ranging from 5.3 to 49.1 L/kg were determined according to the REACH registration dossier for calcium dihydroxide.
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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