Registration Dossier
Registration Dossier
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EC number: 233-042-5 | CAS number: 10025-78-2
Endpoint summary
Administrative data
Description of key information
Abiotic degradation
Trichlorosilane hydrolyses very rapidly in contact with water, generating HCl and silanetriol. Further hydrolysis of silanetriol is then expected to occur rapidly to monosilicic acid [Si(OH)4] and hydrogen. 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.
Biotic degradation
Trichlorosilane and its hydrolysis products are inorganic substances and as such biodegradation is not relevant.
Table 4.1.4: Degradation rates
Degradation rate in water: |
Very rapid hydrolysis to HCl and silanetriol. Further rapid hydrolysis of silanetriol to monosilicic acid [Si(OH)4] and hydrogen. Monosilicic acid and silanetriol 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 Biodegradation is not relevant as the substance and its hydrolysis products are inorganic. |
Degradation rate in sediment: |
The hydrolysis products are inorganic substances which enter natural biogeochemical cycles; degradation studies are not relevant |
Degradation rate in soil: |
The hydrolysis products are inorganic substances which enter natural biogeochemical cycles; degradation studies are not relevant |
Degradation rate in air: |
Reaction with water vapour, rather than photolysis, is expected to be the primary degradation process of trichlorosilane in air. |
Additional information
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