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There are no tests available on terrestrial toxicity for silicon orthophosphate. 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). Since silicates are natural components of soil minerals, such tests would be of limited value.

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. The contribution of anthropogenic inputs to the occurrence in the various compartments will be negligible compared to the concentrations contributed to by the natural silica flux.

References:

OECD SIDS (2004). Synthetic amorphous silica and silicates, SIDS Initial Assessment Report for SIAM 19, Berlin, Germany, 19-22 October 2004.