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If silicon orthophosphate is released into the aquatic environment, it dissociates rapidly to give silicon and phosphate ions (relevant pH values range from 4 – 9). The tetravalent silicon ion and the phosphate ion will then react with the media to form different silicon and phosphate species indistinguishable from natural dissolved silica- or phosphorus species. Neither silica species, nor aqueous phosphate has been assessed as bioaccumulative, nor are expected to be (OECD SIDS, 2004; OECD SIDS, 2009).


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

OECD (2009). SIAP SIDS Inititial Assessment Profile for Phosphoric acid; CAS No. 7664-38-2; UNEP Publications.