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Environmental fate & pathways

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Bioaccumulation is not relevant for calcium oxide. In the aquatic environment and in soil, exposure to calcium oxide actually comes down to exposure to calcium and hydroxyl ions. There will be no intake of calcium oxide as such from water or soil, nor will calcium oxide prevail under its original form in the organisms. Moreover, both the intake of the essential element calcium and the internal pH (hydroxyl ions) of an organism are actively regulated (homeostasis).

Similarly, 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 thus not expected or relevant.