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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Diss Factsheets
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EC number: 229-912-9 | CAS number: 6834-92-0
- 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
Monitoring data
Administrative data
- Endpoint:
- monitoring data
- Type of information:
- read-across based on grouping of substances (category approach)
- Adequacy of study:
- key study
- Justification for type of information:
- Refer to category justification provided in IUCLID section 13.
Cross-referenceopen allclose all
- Reason / purpose for cross-reference:
- read-across source
Reference
- Endpoint:
- monitoring data
- Type of information:
- other: Qualitative estimations
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Well-documented scientific publication.
- Principles of method if other than guideline:
- General qualitative estimations and theoretical considerations
- GLP compliance:
- no
RM-Freetext:
SiO2 enters surface waters via the four main application areas where emissions to water systems might occur (household detergents, pulp-and paper production, water treatment, and soil stabilisation).
Seen in the context of the natural silica cycle, and natural loading of water systems with silicates due to weathering of soil and rocks, weathering of sediments and atmospheric deposition, this amount is small.
- Reason / purpose for cross-reference:
- read-across source
Reference
- Endpoint:
- monitoring data
- Type of information:
- other: survey of published water analyses
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Well-documented scientific publication.
- Principles of method if other than guideline:
- survey of published water analyses from the United States Geological Survey or published by state agencies.
- GLP compliance:
- no
- Type of measurement:
- background concentration
- Media:
- surface water
- Country:
- United States (the)
- Substance or metabolite:
- other: SiO2
- Conc.:
- ca. 14 mg/L
- Remarks on result:
- other: The median value in the US was reported to be 17 mg SiO2/l for streams
RM-Freetext:
The median value in the US was reported to be 17 mg SiO2/l for streams.
- Reason / purpose for cross-reference:
- read-across source
Reference
- Endpoint:
- monitoring data
- Type of information:
- other: survey of published water analyses
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Well-documented scientific publication.
- Principles of method if other than guideline:
- survey of published water analyses from the United States Geological Survey or published by state agencies.
- GLP compliance:
- no
- Type of measurement:
- background concentration
- Media:
- ground water
- Country:
- United States (the)
- Substance or metabolite:
- other: SiO2
- Conc.:
- ca. 17 mg/L
- Remarks on result:
- other: The median value in the US was reported to be 17 mg SiO2/l for ground waters.
RM-Freetext:
The median value in the US was reported to be 17 mg SiO2/l for ground waters.
- Reason / purpose for cross-reference:
- read-across source
Reference
- Endpoint:
- monitoring data
- Type of information:
- other: supporting dissociation data
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Acceptable procedure and publication
- Principles of method if other than guideline:
- Staements from handbooks based on theoretical considerations.
- GLP compliance:
- no
- Type of measurement:
- background concentration
- Media:
- other: surface-, ground- or drinking water
RM-Freetext:
Dissolved silica from commercial soluble silicates is
indistinguishable from natural dissolved silica since
depolymerisation of polysilicate anions to monomeric
dissolved silica occurs very rapidly when commercial soluble
silicate solutions are diluted with water. Therefore any
soluble silica input to the natural silica cycle as a result
of the production or use of commercial soluble silicates
will be insignificant in view of the size and high flux of
the natural silica cycle.
- Reason / purpose for cross-reference:
- read-across source
Reference
- Endpoint:
- monitoring data
- Type of information:
- other: Compilation of analyses
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Well-documented scientific publication.
- Principles of method if other than guideline:
- Compilation of worldwide river water analyses
- GLP compliance:
- no
- Type of measurement:
- background concentration
- Media:
- surface water
- Country:
- other: world
- Substance or metabolite:
- other: SiO2
- Conc.:
- ca. 13 mg/L
- Remarks on result:
- other: The worldwide mean concentration in rivers is 13 mg SiO2/l.
RM-Freetext:
The worldwide mean concentration in rivers is 13 mg SiO2/l.
- Reason / purpose for cross-reference:
- read-across source
Reference
- Endpoint:
- monitoring data
- Adequacy of study:
- key study
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: Handbook data
- Principles of method if other than guideline:
- General statement based on theoretical considerations
- GLP compliance:
- no
RM-Freetext:
Natural occurrence:
Compounds of silicon comprise ca. 59% of the earth's crust, constituted by minerals, soils and sediments,dissolved silica, amorphous silica in the solid phase and silica bound to organic matter.
Dissolved silica is a minor but ubiquitous constituent of the hydrosphere. Dissolved silica is supplied to the
environment by chemical and biochemical weathering processes.
Data source
Materials and methods
Test material
- Reference substance name:
- Disodium metasilicate
- EC Number:
- 229-912-9
- EC Name:
- Disodium metasilicate
- Cas Number:
- 6834-92-0
- Molecular formula:
- H2O3Si.2Na Soluble Silicates Category
- IUPAC Name:
- disodium oxosilanediolate
Constituent 1
Results and discussion
Concentrationopen allclose all
- Remarks on result:
- not measured/tested
- Remarks:
- Source, key, 1344-09-8, Van Dokkum et al. 2004, Schleyer and Blumberg 1982
- Country:
- United States (the)
- Substance or metabolite:
- other: SiO2
- Conc.:
- 14 mg/L
- Remarks on result:
- other: The median value in the US was reported to be 17 mg SiO2/l for streams
- Remarks:
- Source, key, 1344-09-8, Davis 1964
- Country:
- United States (the)
- Substance or metabolite:
- other: SiO2
- Conc.:
- 17 mg/L
- Remarks on result:
- other: The median value in the US was reported to be 17 mg SiO2/l for ground waters.
- Remarks:
- Source, key, 1344-09-8, Davis 1964
- Remarks on result:
- not measured/tested
- Remarks:
- Source, key, 1344-09-8, O'Connor 1961, Schleyer and Blumberg 1982, Falcone 1997
- Country:
- other: world
- Substance or metabolite:
- other: SiO2
- Conc.:
- 13 mg/L
- Remarks on result:
- other: The worldwide mean concentration in rivers is 13 mg SiO2/l.
- Remarks:
- Source, key, 1344-09-8, Edwards and Liss, 1973
- Remarks on result:
- not measured/tested
- Remarks:
- Source, key, 1344-09-8, Jackson 1964, Falcone 1997
Applicant's summary and conclusion
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.