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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Environmental fate & pathways

Monitoring data

Currently viewing:

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

Constituent 1
Chemical structure
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

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