X-Ray Absorption Spectroscopy of Strontium(II) Coordination

An Analysis of Zinc Sorption to Amorphous versus Crystalline Iron Oxides Using XAS

“…A large number of these studies have shown that metal ions sorb to these oxides through innersphere complexes: Cr(III) to goethite and ferrihydrite (18); Cd to a "two-line ferrihydrite" type of hydrous ferric oxide and to goethite (6); selenate to two-line ferrihydrite and goethite (5); U(VI) to ferrihydrite (19); As(V) and Cr(VI) to goethite (20); Zn to goethite (21); Pb to goethite (22)(23)(24) and to hematite (22); Hg(II) to goethite (25); and Cu and Pb to two-line ferrihydrite (17). In contrast, other studies of iron oxide systems report outersphere types of adsorption mechanisms, where the adsorbate ions retain their waters of hydration; these include ZnEDTA sorption to goethite (21), Sr sorption to HFO (26), PbEDTA sorption to goethite (27), and Sr sorption to goethite (28).…”

87Sr/86Sr and trace element mapping of geosphere-hydrosphere-biosphere interactions: A case study in Ireland

“…Strontium ions can sorb as hydrated ions on iron oxides and clay minerals (Sahai et al, 2000) and therefore argillaceous sediments tend to be enriched in Sr. However, generally, Sr is easily mobilised and readily exchangeable (Bunker et al, 2000).…”

X-Ray Absorption Spectroscopy of Strontium(II) Coordination

“…These results provide constraints on XAS analysis of strontium, as well as insights into the local molecular coordination of hydrated strontium, which are important for the interpretation of contaminant strontium removal from natural waters by sorption or precipitation on mineral surfaces. In our companion study (13), we apply the EXAFS constrained parameters derived here to the spectral analysis of surface sorbed and precipitated strontium.…”