Abstract
AbstractMine waters containing extremely high concentrations of sulfuric acid and dissolved iron are found in the Rio Tinto (Spain) area. In this study, Raman spectroscopy has been used to investigate the speciation of the system iron(II)–sulfuric acid–water as an approach to study Rio Tinto's stream water. Several solutions of aqueous sulfuric acid containing iron(II) sulfate in the range 0–1.65 mol/kg were prepared, and qualitative and quantitative analyses of the ions present in the solutions were carried out using Raman spectroscopy. The intrinsic features of Raman spectroscopy allowed the identification of the species present in solution and calculation of the species concentration through band‐fitting of the Raman spectra. The activity coefficient product of the system iron(II) sulfate–sulfuric acid–water as a function of salt concentration is reported. Previous findings on the formation of iron(II) hexahydrate complexes in the mentioned system have been corroborated by means of Raman spectroscopy. Copyright © 2007 John Wiley & Sons, Ltd.
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