Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 910-697-1 | CAS number: -
Endpoint summary
Administrative data
Description of key information
The substance is a reaction mass of calcium fluoride, calcium sulfate and calcium carbonate.The adsorption/desorption of the substance itself cannot be determined. Therefore conducting a study is considered not appropriate.
Additional information
The substance is a reaction mass of calcium fluoride, calcium sulfate and calcium carbonate.The adsorption/desorption of the substance itself can not be determined. Therefore conducting a study is considered not appropriate.Only adsorption/desorption of the individual ions can be determined. The ions (like calcium, fluoride sulfate, carbonate) are naturally present in the environment and therefore a study does not seem appropriate. Soil biodegradation studies with reaction mass of calcium fluoride, calcium sulfate and calcium carbonate are not possible due to analytical difficulties, the solubility characteristics in water of its constituents and their behaviour in soil (eg: 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, 21 January 2000, for the following reasons: 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 difluoride and/or calcium sulfate and/or calcium carbonate sulfate 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 sulfate or calcium difluoride or 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 fluoride will hydrolyse in the environment only to a very limited extent due to its low water solubility; liberated fluoride ions will react to form other fluorine-containing compounds. The behaviour of fluoride in water is dependent on pH and mineral content. Fluoride is deposited to sediment as insoluble complexes and is essentially immobile in soil due to its incorporation into insoluble complexes. Calcium is ubiquitous in the environment and is present as a number of mineral forms with limited mobility.
The accumulation and mobility of calcium sulfate in soils has been documented in the available literature. Calcium sulfate has a low potential for adsorption to soil. The sulfate ion is sufficiently mobile to penetrate subsoil readily. Calcium accompanies sulfate into the subsoil (Shainberg et al. 1989). The rate at which soluble sulfates are gradually leached away is dependent upon the water supply. Calcium sulfate also accumulates in humid regions, the upper layers of soil and rock are kept thoroughly leached, and as fast as they are formed the soluble products are removed in the drainage water. In semi-arid regions, the soils are not fully leached and soluble salts tend to accumulate. The organic carbon content of the soils is not anticipated to play a significant role in the mobility of simple inorganic salts such as calcium sulfate and therefore the actual test endpoint, that of an organic carbon normalised adsorption coefficient (Koc) is probably not actually valid/relevant for this type of substance. For the calcium content at least, pH, water potential and carbon dioxide partial pressure amongst others will be controlling factors.
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, reaction mass of calcium fluoride, calcium sulfate and calcium carbonate does not have a high potential for adsorption to soil.
References: Shainberg I, Sumner ME, Miller WP, Farina MPW, Pavan MA and Fey MV (1989) Use of gypsum on soils. Advanced Soil Sci., 9: 1-111
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
