title: Iron speciation in natural hyperacid water investigated by Mössbauer spectroscopy.
abstract: We have demonstrated the usefulness of the archetypical solid state-technique of Mössbauer spectroscopy to non-invasive studies of the redox and coordination chemistry of iron in a natural hyperacid solution from Iron Mountain, CA. Suitable fast cooling conditions were used to prepare a glass from the natural solution. Measurements of spectra at low temperatures (6 and 15K) and in large external magnetic fields (6T) of the glassy, frozen solution revealed a behaviour characteristic of slow paramagnetic relaxation of ferric ions. Analyses of the spectral components are in good agreement with dominance of hexaaquairon(III) ions.
authors.affiliation: Department of Basic Sciences and Environment, Faculty of Life Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark. cbk@life.ku.dk
authors.forename: C
authors.initials: C
authors.lastname: Bender Koch
authors.forename: H K
authors.initials: HK
authors.lastname: Rasmussen
authors.forename: S
authors.initials: S
authors.lastname: Mørup
mesh_terms: D000143:Acids / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D015204:Spectroscopy, Mossbauer; D014867:Water / Q000737:chemistry*
chemical_list: D000143:Acids; D014867:Water; D007501:Iron