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Iron oxides and oxyhydroxides form via Fe3+ hydrolysis and polymerization in many aqueous environments, but the pathway from Fe3+ monomers to oligomers and then to solid phase nuclei is unknown. In this work, using combined X-ray, UV-vis, and Mössbauer spectroscopic approaches, we were able to identify and quantify the long-time sought ferric speciation over time during ferric oxyhydroxide formation in partially-neutralized ferric nitrate solutions ([Fe3+]=0.2M, 1.8

Graph: Professor Donald Sparks This Special Issue of I Geochemical Transactions i is dedicated to Professor Donald L. Sparks, the S. Hallock du Pont Chair in the Department of Plant and Soil Sciences, and the Director of the Delaware Environmental Institute, at the University of Delaware (UD), in celebration and honor of his life-long research interests and achievements in environmental soil chemistry. Then, several articles by Sowers et al. [[5]], Stuckey et al. [[6]], Sundman et al. [[7]], and Zhu et al. [[8]] discuss how iron and manganese (hydr)oxides interact with organic compounds undergoing redox reactions and dissolution. Nickel, zinc, and copper in soils are trace transition metals and critical nutrients as well. [Extracted from the article]