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EC number: 233-042-5
CAS number: 10025-78-2
The substance hydrolyses very
rapidly to give silanetriol and HCl. The Si-H bonds of
trichlorosilane also react in water (assumed half-life <12 hours at pH 7
and 25°C) to produce hydrogen and monosilicic acid. Both silanetriol and
monosilicic acid exist only in dilute aqueous solutions and readily
condense 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 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 trichlorosilane, and indicates that the input is
considered negligible in comparison with the natural flux of
silica/silicic acid in the environment.
it is not appropriate to calculate Predicted Environmental
Concentrations (PECs) for the hydrolysis product monosilicic acid.
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