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As an inorganic compound, silicon orthophosphate is insoluble in n-octanol, making determination of a log Kow not feasible. If silicon orthophosphate is released into the environment, it is expected to combine indistinguishably with the soil or sediment, due to the similarity with inorganic soil/sediment matter and will be subjected to natural processes under environmental conditions (cation exchange, dissolution, sedimentation).

Of the elemental composition of the earth’s crust, silicon is the second most abundant element after oxygen, i.e. 28% (Salminen, 2012). Silicon oxides are the most abundant compounds in the earth’s crust mass (> 60%; Salminen, 2012). Compounds of silicon, oxygen and phosphorus are ubiquitous in the environment; they are present in inorganic matter, like minerals and soils as well as in organic matter, like plants, animals and man. By weathering of soil, rocks and sediments and by atmospheric deposition, silica is released into surface and ground waters from where it may be removed by precipitation and sedimentation or taken up by living organisms.


Salminen R. (ed.) (2012): FOREGS: Geochemical Atlas of Europe.ISBN 951-690-913-2 (electronic version).