Abstract
Adsorption of elements on the surface of mineral is important process with respect to the concentration and migration in soils and aquatic environments. Understanding of surface speciation is needed to evaluate the long-term behavior of dissolved elements. Ferrihydrite, nano-mineral widely distributed in the surface envirnoment is an effective anion adsorbent because of its positively-charged surface in natural water. It is reported that sulfate affects the coexistence inorganic anion, trace metals and organic acid adsorption. The present study aims to reveal the surface speciation of sulfate at the electrolyte solution-ferrihydrite interface under various pH and ionic strength conditions by means of in-situ IR spectroscopy.
