Registration Dossier
Registration Dossier
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EC number: 201-083-8 | CAS number: 78-10-4
Bioaccumulation: aquatic / sediment
Administrative data
Link to relevant study record(s)
- Endpoint:
- bioaccumulation in aquatic species: fish
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- the study does not need to be conducted because the substance has a low potential for bioaccumulation based on log Kow <=3 and a low potential to cross biological membranes
- the study does not need to be conducted because direct and indirect exposure of the aquatic compartment to the substance is unlikely
Reference
Description of key information
Bioaccumulation: aquatic/sediment: Low potential for bioaccumulation
Key value for chemical safety assessment
Additional information
Testing is waived in accordance with Column 2 of REACH Annex IX. Direct or indirect exposure of aquatic organisms to the registered substance is very limited due to the instability of the substance in water. The substance hydrolyses rapidly in contact with water to form monosilicic acid [CAS 10193-36-9; EC No. 233-477-0, Si(OH)4] and ethanol (CAS 64-17-5; EC No. 200-578-6). In addition, the substance has a low predicted log Kow value of <3.
Ethanol is readily biodegradable and has very low log Kow.
Silicic acid condenses at concentrations above approximately 100-150 mg/L as SiO2 to give insoluble amorphous polysilicic acid. These hydrolysis products are inorganic substances which enter natural biogeochemical cycles.
Monosilicic acid is the bioavailable form of silica that can be absorbed by certain organisms in the environment. In these organisms, silicic acid, precipitated as insoluble amorphous silica, plays a structural and defensive role. In animals, silica is a trace nutrient.
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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