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biodegradation in soil: simulation testing
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
Justification for type of information:
According to Annex IX, section of Regulation No. 1907/2006, soil simulation testing is required for substances with a high potential for adsorption to soil. However, such a study is not applicable to the substance for the following reasons: Calcium carbonate and silica as compounds of the test substance are inorganic substances and do not undergo biodegradation i.e. microbial degradation to carbon dioxide and water. Calcium carbonate will be degraded in the environment by means other than biodegradation. The ions will dissociate; calcium will be assimilated by species in the water and is necessary to maintain a good chemical balance in soils, water and plants and carbonate will become part of the carbon cycle. Furthermore, 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. A study to identify the biodegradation of calcium carbonate in soil is therefore not required. Furthermore, silica /silicates are one of the most abundant materials in earth´s surface and calcium silicate is an inorganic, stable/inert compound which is not biologically transformed.

Data source

Materials and methods

Results and discussion

Transformation products:

Applicant's summary and conclusion