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Removal of Hg from the Ebro River. (A) View of the precipitate resulting from the treatment of 6.5 ppm Hg (II) with Au NPs (1.7 nM Au NPs, 7.1 ppm Au) in Ebro River water (41% elimination). (B) Optical microscope image of the precipitate taken at 40× magnification and zoom. Reproduced with permission from [111]. Copyright American Chemical Society, 2012.
