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The sorption of Eu species onto nano-size silica-water interfaces is investigated at pH range of 1―8.5 and the initial Eu concentrations (CEu) of 2×10−5, 2×10−4 and 2×10−3 M using fluorescence spectroscopy. The sorption rate of Eu is initially low, but significantly increases at pH > 4. For the initial CEu of 2×10−5, 2×10−4 and 2×10−3 M, the dissolved Eu species are completely sorbed onto silica-water...