Here we focus on applications of synchrotron radiation methods, particularly XAFS spectroscopy, in determining the mode(s) of sorption (i.e. inner-sphere vs. outer-sphere, mononuclear vs. polynuclear, monodentate vs. bidentate or tridentate, polyhedral edge vs. corner sharing, precipitate vs. true adsorption complex) and sorption complex structures of aqueous metal ions and oxoanions on metal oxides and (oxyhydr)oxides. Another topic we discuss is sorption on nanoparticles, illustrated by arsenic sorption on nanocrystalline magnetite.

One problem encountered in comparing in situ XAFS or X-ray scattering studies of sorption products at mineral-water interfaces is the lack of complete and reliable information on sorbent surface...

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