Registration Dossier
Registration Dossier
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EC number: 233-054-0 | CAS number: 10026-04-7
Endpoint summary
Administrative data
Description of key information
The substance hydrolyses very rapidly in contact with water, generating monosilicic acid and hydrochloric acid (HCl). Monosilicic acid exists only in dilute aqueous solutions and readily condenses at concentrations above approximately 100 -150 mg/L as SiO2 to give a dynamic equilibrium between monomer, oligomers and insoluble amorphous polysilicic acid.
These hydrolysis products are inorganic substances which enter the natural biogeochemical cycles. Monosilicic acid and its condensation products are ubiquitous in the environment.
A comparison of the total flux of dissolved silica into rivers can be compared with the input from manufacture and use of silicon tetrachloride (refer to CSR Section 9) and indicates that the input is considered negligible in comparison with the natural flux of silica/silicic acid in the environment.
Therefore, it is not appropriate to calculate Predicted Environmental Concentrations (PECs) for the hydrolysis product, monosilicic acid.
Additional information
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