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FTIR spectral components of schwertmannite
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2010 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 44, no 4, p. 1185-1190Article in journal (Refereed) Published
Abstract [en]

Fourier transform infrared (FTIR) spectral components of three dominant groups of sulfate species in synthetic schwertmannite (Fe8O8(OH)6-x(SO4)x*nH2O) are presented. These components were extracted by multivariate curve resolution analysis of spectra obtained from N2(g)-dry samples initially reacted in aqueous solutions (pH 3-9) at room temperature. Each component contains complex sets of bands that correspond to mixtures of similar species. We tentatively assign these components to sulfate ions that are hydrogen- (components I and III) and iron-bonded (component I) to schwertmannite. Another component (II) is assigned to protonated sulfate species. Heating experiments to 130 degrees C moreover confirmed this possibility for component II. The spectral components extracted from this study can be used to identify dominant sulfate species in FTIR spectra of naturally occurring schwertmannite samples.

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2010. Vol. 44, no 4, p. 1185-1190
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URN: urn:nbn:se:umu:diva-33259DOI: 10.1021/es902803uISI: 000274347800007PubMedID: 20067282Scopus ID: 2-s2.0-77249122214OAI: oai:DiVA.org:umu-33259DiVA, id: diva2:311139
Available from: 2010-04-20 Created: 2010-04-20 Last updated: 2023-03-23Bibliographically approved

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Boily, Jean-François

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