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Environmental fate & pathways

Adsorption / desorption

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Rationale for read-across:
In soil as well as in sediment-water systems, calcium magnesium oxide will react and release calcium ions, magnesium ions and hydroxyl ions. Therefore, relevant information on adsorption/desorption of calcium magnesium oxide can be broadened to data on adsorption/desorption of calcium and magnesium. The behaviour of hydroxyl ions depends on the pH buffer capacity of the tested medium. The pH buffer capacity is controlled by a whole range of processes (mineral dissolution/precipitation, protonation/deprotonation of pH dependent charge sites, reaction with CO2, biological processes etc.) and as such, Kd values are not relevant for the fate and behaviour of OH- in soils or sediment.

Key value for chemical safety assessment

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