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Diss Factsheets
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EC number: 935-756-9 | CAS number: 1344-95-2
- 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
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no data: aquatic toxicity unlikely
Marine water
- Hazard assessment conclusion:
- no data: aquatic toxicity unlikely
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 100 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- no hazard identified
Sediment (marine water)
- Hazard assessment conclusion:
- no hazard identified
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no data available: testing technically not feasible
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
When dissolved in water Silicic acid, Calcium salt decomposes for a small part in Ca2+ and (amorphous silica) SiO32- ions. The solubility was shown to be 8.9 mg/L Si-ion and 17.5 mg/L Ca-ion. It is argued that these concentrations do not pose any harm to aquatic organisms.
Compounds of silicon and oxygen are ubiquitous in the environment; they are present in inorganic matter, like minerals and soils as well as in organic matter, like plants, animals and man. By weathering of soil, rocks and sediments and by atmospheric deposition, silica is released into surface and ground waters from where it may be removed by precipitation and sedimentation or taken up by living organisms, especially diatoms. Silica is found in all surface waters. Median values were reported to be 17 mg SiO2/L for ground waters and 14 mg SiO2/L in the US; the worldwide concentration in rivers is 13 mg SiO2/L and in Europe 7.5 mg/L. SiO32 - in water results in SiO32 -+ H20 --> 2OH-+ SiO2 (Solid). All available aquatic toxicity tests with silicates revealed toxicity only at concentrations well above 100 mg/L. This corresponds to well above 50 mg Si/L. The effects observed in the aquatic toxicity studies are stated to be mainly governed by their intrinsic alkalinity. However, most natural aquatic ecosystems are slightly acid or alkaline and due to the high buffer capacity of these ecosystems pH effects of soluble silicates to aquatic organisms are very unlikely. Therefore it is argued that SiO32- will not pose any toxicity among aquatic organisms.
Likewise, Ca2+ is an essential element and it is one of the elements in standard water (ISO 6341& 7346, OECD 202 & 203) used in aquatic toxicity tests. The required Ca content in ISO 6341 standard water is 80 mg Ca2+/L. Thus, the 17.5 mg Ca2+/L is below the advised level of Ca2+ content in water used for toxicity testing. Moreover, an overview of toxicity data in the database Aquire (US EPA) shows that 17.5 mg/L Ca2+ does not result in any toxicity among aquatic organisms.
It is concluded that the derivation of a PNEC for Silicic acid, Calcium salt or is degradation products is not possible.
Conclusion on classification
Silicic acid, calcium salt is therefore not classified as hazardous to the enviroment according to Regulation 1272/2008/EC
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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