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EC number: 233-042-5 | CAS number: 10025-78-2
Biodegradation in water and sediment: simulation tests
Administrative data
Link to relevant study record(s)
- Endpoint:
- biodegradation in water: sediment simulation testing
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
- Transformation products:
- yes
- No.:
- #1
- No.:
- #2
- No.:
- #3
- Details on transformation products:
- Degradation of the registration substance is expected to be principally via abiotic transformation under aqueous conditions (such as in a degradation simulation study). Therefore, the transformation products expected in the environment are those identified in the abiotic degradation study (reported in Section 5.1.2 of the IUCLID). Environmental hazard assessment is based on the properties of the hydrolysis products.
- Endpoint:
- biodegradation in water: simulation testing on ultimate degradation in surface water
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- other:
- Transformation products:
- yes
- No.:
- #1
- No.:
- #2
- No.:
- #3
- Details on transformation products:
- Degradation of the registration substance is expected to be principally via abiotic transformation under aqueous conditions (such as in a degradation simulation study). Therefore, the transformation products expected in the environment are those identified in the abiotic degradation study (reported in Section 5.1.2 of the IUCLID). Environmental hazard assessment is based on the properties of the hydrolysis products.
Referenceopen allclose all
Description of key information
Key value for chemical safety assessment
Additional information
- The substance is used under highly controlled conditions and, therefore, exposure of the aquatic and sediment environments is low
- The substance hydrolyses very rapidly in contact with water, generating HCl and silanetriol. Further hydrolysis of silanetriol is then expected to occur rapidly to monosilicic acid 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; degradation studies are not relevant.
Testing is waived on the basis that the chemical safety assessment according to Annex I indicates that it is not necessary to conduct the simulation test on ultimate degradation in surface water and the sediment simulation test, or to identify degradation products.
Simulation tests (water and sediments) are not considered necessary because:
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.
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