Registration Dossier
Registration Dossier
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EC number: 200-848-3 | CAS number: 75-20-7
Endpoint summary
Administrative data
Description of key information
Due to the identified uses of CaC2 direct release of the substance to soil can be excluded. Indirect exposure (deposition via air) is negligible as CaC2 is released to air in the form of fine particles with very high surface area. In presence of air humidity the fine CaC2 particles are transformed to Ca(OH)2 and C2H2. C2H2 as a gas will remain in the gaseous phase, and will be quickly diluted and undergo phototransformation. Due to the very high surface area of Ca(OH)2 particles they will undergo quick transformation to CaCO3 upon contact with CO2 (within hours to few days), which is a well established property of Ca(OH)2. Thus, only CaCO3 will be deposited on soil. CaCO3 is of no toxicological or environmental concern since being a ubiquitous constituent of any soil matrix. In conclusion, any exposure of the terrestrial environment to calcium carbide can be excluded due to the substance's rapid transformation, and the relevant degradation products being of no environmental concern.
Additional information
Due to the identified uses of CaC2 direct release of the substance to soil can be excluded. Indirect exposure (deposition via air) is negligible as CaC2 is released to air in the form of fine particles with very high surface area. In presence of air humidity the fine CaC2 particles are transformed to Ca(OH)2 and C2H2. C2H2 as a gas will remain in the gaseous phase, and will be quickly diluted and undergo phototransformation. Due to the very high surface area of Ca(OH)2 particles they will undergo quick transformation to CaCO3 upon contact with CO2 (within hours to few days), which is a well established property of Ca(OH)2. Thus, only CaCO3 will be deposited on soil. CaCO3 is of no toxicological or environmental concern since being a ubiquitous constituent of any soil matrix. In conclusion, any exposure of the terrestrial environment to calcium carbide can be excluded due to the substance's rapid transformation, and the relevant degradation products being of no environmental concern.
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