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EC number: 273-761-1 | CAS number: 69012-64-2 Amorphous silicon dioxide particles from the volatilization and vaporization of furnace feed materials in the manufacture of ferrosilicon and silicon.
Endpoint summary
Administrative data
Description of key information
Additional information
Silica is very ubiquitous in the aquatic and terrestrial environments. Natural background concentrations dominate the total Si concentration in the environment. Anthropogenic releases of elemental silicon is transformed/oxidized to silica (SiO2) in the environment Anthropogenic sources can be expected to have no influence or only insignificant influence on background levels of silica. High quality background levels measurements data of silica in the European environment is available (source: Geochemical Atlas of Europe; copyright © 2005 the Association of the Geological Surveys of The European Union (EuroGeoSurveys)/ the Geological Survey of Finland).The geochemical data are based on the analysis of samples of stream water, stream sediment, floodplain sediment (or alluvial soil), residual soil, and humus collected from 26 European countries. High quality and consistency of the data were ensured by using standardised sampling methods and by applying harmonised quality assurance measures during chemical analysis and subsequent data handling stages.
Table : Summary of silica background concentrations from the 26 EU member states
Media |
Parameter |
Unit |
Count |
Minimum |
Median |
Mean |
Standard deviation |
Percentile 90 |
Maximum |
Si - Silica |
|||||||||
Subsoil |
SiO2 |
% |
788 |
0.61 |
68.0 |
65.5 |
17.5 |
85.6 |
98.1 |
Topsoil |
SiO2 |
% |
845 |
1.47 |
67.7 |
65.4 |
16.5 |
85.6 |
96.7 |
Water |
SiO2 |
mg/l |
808 |
0.10 |
8.03 |
9.10 |
6.60 |
16.0 |
72.0 |
Stream sediment |
SiO2 |
% |
850 |
2.50 |
61.3 |
60.1 |
14.9 |
77.0 |
94.0 |
Floodplain sediment |
SiO2 |
% |
749 |
7.90 |
64.6 |
62.9 |
15.3 |
80.6 |
100 |
Geochemical Atlas of Europe; copyright © 2005 the Association of the Geological Surveys of The European Union (EuroGeoSurveys)/ the Geological Survey of Finland.
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