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Environmental fate & pathways

Monitoring data

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Administrative data

Endpoint:
monitoring data
Type of information:
other: supporting dissociation data
Adequacy of study:
other information
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Acceptable procedure and publication

Data source

Referenceopen allclose all

Reference Type:
publication
Title:
The reaction rates of polysilicic acids with molybdic acid
Author:
O'Connor TL
Year:
1961
Bibliographic source:
J. Phys. Chem. 65, 1-5.
Reference Type:
review article or handbook
Title:
Health, safety and|environmental aspects of soluble silicates.
Author:
Schleyer WL and Blumberg JG
Year:
1982
Bibliographic source:
Soluble Silicates, Falcone JS (ed). ACS Symposium Series 194, Chapter 4, 49-69.
Reference Type:
review article or handbook
Title:
Silicon compounds - Synthetic inorganic silicates.
Author:
Falcone JS
Year:
1997
Bibliographic source:
Kirk-Othmer Encyclopedia of Chemical Technology, 4th ed. Wiley, New York, USA. 22, 1-30.

Materials and methods

Principles of method if other than guideline:
Statements from handbooks based on theoretical considerations.
Type of measurement:
background concentration
Media:
other: surface-, ground- or drinking water

Test material

Constituent 1
Chemical structure
Reference substance name:
Silicic acid, potassium salt
EC Number:
215-199-1
EC Name:
Silicic acid, potassium salt
Cas Number:
1312-76-1
Molecular formula:
K2O x (SiO2)n with Molar Ratio (MR) (SiO2/K2O): 0.5 – 5 (with exception of MR = 1)
IUPAC Name:
potassium hydroxy(oxo)silanolate
Constituent 2
Chemical structure
Reference substance name:
Silicic acid, sodium salt
EC Number:
215-687-4
EC Name:
Silicic acid, sodium salt
Cas Number:
1344-09-8
Molecular formula:
Na2O x (SiO2)n with Molar Ratio (MR) (SiO2/Na2O): 1.5 – 4
IUPAC Name:
Silicic acid, sodium salt

Results and discussion

Any other information on results incl. tables

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.

Applicant's summary and conclusion

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