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Sediment toxicity

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There is no test available on sediment toxicity. However, dissolved silica from commercial soluble silicates are indistinguishable from natural dissolved silica. Further, SiO2 makes up 59% of the earths crust and similar percentages are present in many sediments and soils. The amount of soluble silicate introduced into the environment must be seen in the context of the background input due to geochemical weathering processes of silicate minerals. For example, the total flux of dissolved silicate transported by rivers to the sea in Western Europe is estimated to be 5 Mtons SiO2/year (Van Dokkum et al. 2004). The anthropogenic contribution to this total flux is only 4 %, although local contributions might be higher. 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.