Registration Dossier
Registration Dossier
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EC number: 207-439-9 | CAS number: 471-34-1
Endpoint summary
Administrative data
Description of key information
Calcium carbonate does not have a high potential for adsorption to soil.
Additional information
Soil biodegradation studies with calcium carbonate are not possible due to analytical difficulties, the solubility characteristics of calcium carbonate in water and calcification.
No experimental determination of the adsorption coefficient of the test material is considered to be possible by Method 106 of the OECD Guidelines for Testing of Chemicals due to the absence of a suitable substance specific method of analysis that would allow distinction between any calcium fortified into the soil/solution system as calcium carbonate and that present due to the guideline requirement to use 0.01 M calcium chloride solution as the aqueous phase in each soil/solution system. If 0.01 M calcium chloride was excluded from each test system, then continued interference would be anticipated due to contributions from calcium carbonate and other calcium containing salts/compounds present as a naturally occurring mineral fraction of the soils present in each soil/solution system.
Calcium carbonate has a propensity to leach through soil if water is applied, i.e. it does have some mobility through soil, providing sufficient water is present. As it moves downwards into layers where the water content is low, the leaching will stop. On this basis, calcium carbonate does not have a high potential for adsorption to soil.
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