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Environmental fate & pathways

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Description of key information

Nanomaterials do not reach equilibrium in adsorption-desorption studies with soils. 

Adsorption and desorption are not applicable because silicon dioxide/silicate and aluminum are two of the most abundant materials in the Earth´s surface.

Additional information

Synthetic amorphous aluminum sodium silicates like Silicic acid, aluminum sodium salt (CAS 1344-00-9, NAS) are not volatile under environmental conditions due to their chemical nature and inherent physical properties: 

Due to their low water solubility and extremely low vapour pressure, silicates are expected to be distributed mainly into soils/sediments, weakly into the water, and probably not at all into the air.

Synthetic amorphous Silicic acid, aluminum sodium salt (CAS 1344-00-9, NAS) is expected to combine undistinguishably with the soil layer or sediment due to its chemical identity with inorganic soil matter and will be subjected to slow natural transformation processes of weathering.