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Sediment toxicity

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Reference
Endpoint:
sediment toxicity: long-term
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

No study is available to assess the sediment toxicity of calcium carbonate.

Key value for chemical safety assessment

Additional information

Calcium carbonate and calcium and carbonate ions are ubiquitous in the environment and are found naturally in soil, water and sediment. Sediments naturally contain a high concentration of calcium and carbonate due to the physical and/or chemical weathering of calcium-rich rocks that takes place in the environment. The precipitation and deposition of calcium carbonate, usually as calcite, is a widely observed phenomenon in hard water lakes (Womble et al 1996). Calcium carbonate, usually derived primarily from autochthonous formation, has been reported to be a major component of the sediments of many hard water lakes. Calcium will be assimilated by species residing in the sediment and is necessary to maintain a good chemical balance in soils, water and sediment. The carbonate will become part of the carbon cycle and is then cycled throughout the biosphere.

Due to the natural occurrence of calcium carbonate in the environment, it is expected that calcium carbonate would not be toxic to sediment organisms and hence, long-term toxicity tests are scientifically unjustified.