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Environmental fate & pathways

Adsorption / desorption

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Adsorption of dissolved silica to soil and sediments is not strong and it is relatively mobile in soil. Adsorption takes place primarily to inorganic materials and to a lesser extent to organic material. A value Koc < 10 L/kg can be given as a coarse calculated  estimate (EUSES 2.1) . Measured Kd to activated carbon and starch were low 0.1-10. Measured Kd to minerals Bauxite, Limonite, Hematite and Goethite were between 100-1000. 

Key value for chemical safety assessment

Koc at 20 °C:

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