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EC number: 231-130-8
CAS number: 7440-21-3
Silicon and Si(OH)4are generally known to have no or very low potential for bioconcentration and bioaccumulation. Certain aquatic species (e.g. diatomae) may actively concentrate Si in their body and Si is also an essential element for some species. These issues must be documented in the CSA report but these findings must not be considered as a harmful ecotoxicological effects. It is not reasonable to derive BCF vales for silica.
The inorganic Si species have no tendency or low intrinsic
tendency for bioconcentration and bioaccumulation if taken up passively
by the species.
Dissolved Si is in surface water as undissosiated neutral molecule
Si(OH)4. It has a very low calculated octanol water partition
coefficient value (Log Kow (KOWWIN v1.67 estimate) = -4.32). It must be
pointed out, that Log Kow is a parameter reflecting bioconcentration
potential and applicable mainly for organic substances. . Applying it
for silicic acid is therefore questionable and is used here only for
illustrative purposes. The calculated value still gives some indication
of the properties of the substance (bioconcentration, absorption,
adsorption etc.) even if the substance is inorganic.
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.
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