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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

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.

Key value for chemical safety assessment

Additional information

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.