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Diss Factsheets
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EC number: 260-350-7 | CAS number: 56706-10-6
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
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Endpoint summary
Administrative data
Description of key information
Additional information
The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2), see table below. Due to the moderate to slow rate of hydrolysis of the parent substance, the distribution calculation is done for the registration substance and its silanol hydrolysis product.
The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2), see table below. Due to the moderate to slow rate of hydrolysis of the parent substance, the is done for both the registration substance and its silanol hydrolysis product. For environmental exposure assessment, the distribution in the STP of the silanol hydrolysis product has been set to that of the parent due to the hydrolysis half-life of the substance.
Table. Distribution modelling for STP
| 4,4,13,13-tetraethoxy-3,14-dioxa-8,9-dithia-4,13-disilahexadecane, CAS 56706-10-6; EC No. 260-350-7 | Silanol HP |
|
Fraction of emission directed to water by STP | 4.57 | 100 | [%] |
Fraction of emission directed to air by STP | 84.42 | 1.73E-15 | [%] |
Fraction of emission directed to sludge by STP | 11.01 | 3.25E-05 | [%] |
Fraction of the emission degraded in STP | 0 | 0 | [%] |
4,4,13,13-Tetraethoxy-3,14-dioxa-8,9-dithia-4,13-disilahexadecane (S2) hydrolyses at a moderate rate in contact with water to form (3-{[3-(trihydroxysilyl)propyl]disulfanyl}propyl)silanetriol and ethanol. S2 is not expected to undergo any significant biodegradation, is predicted to have very high Henry’s Law constant and high log Kow/log Koc. Therefore, air is the main compartment to which it is expected to partition in a sewage treatment plant.
4,4,13,13-Tetraethoxy-3,14-dioxa-8,9-dithia-4,13-disilahexadecane hydrolyses to give the corresponding silanetriol and ethanol. The hydrolysis half-life is >40 hours at 20-25°C. The hydrolysis half-life is such that the initial release to the environment will be as parent substance but subsequent exposure to the hydrolysis product could also occur. It is therefore necessary to consider the environmental exposure to both the parent and hydrolysis products. As the initial release to the STP will be as parent it is relevant to use the same removal and distribution in the STP as the parent for the hydrolysis product. This assumes that the majority of the hydrolysis of the parent to the silanol occurs after the STP and ensures that the correct fractions to water and sewage sludge are estimated.
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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