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Environmental fate & pathways

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CaSi is an inorganic substance and it is not biodegradable in a sense of microbiological utilization of the substance as a source of carbon and energy. The substance is expected to be highly resistant to microbiological activity and sufficient evidence exists to show that no biodegradability studies are needed for this substance. However, depending on conditions, the (dissolved ionic/neutral Ca (II) Si (IV) )constituents may still be subject to biologically mediated processes leading to biotransformations. Calcium is an essential element and nutrient for all living organisms.

Dissolved silica (as Si(OH)4) is still subject to biologically mediated processes leading to transformations of biologically absorbed silica. However, for instance Si is not known to be associated covalently to any organic molecules in biological processes (Craig, 1986). These processes are discussed in more detail under chapters dealing with bioaccumulation where a short description of biologically mediated transformation processes is given.

Craig P.J., (ed) 1986, Organometallic compounds in the environment, Wiley & Sons, NY