NDLI: Characterisation by Mössbauer Spectroscopy of the Forms of Iron in Sulfide-Rich Fulvic Acid Solutions

Content Provider	Springer Nature Link
Author	Goodman, B. A. Cheshire , M. V.
Copyright Year	2002
Abstract	Variations in the nature of the bonding between iron and fulvic acid as a function of pH in sulfide-rich solutions have been investigated by 57Fe Mössbauer spectroscopy. In all solutions iron was enriched to 95% in the 57Fe isotope and ratios of Fe : fulvic acid were maintained at 1 : 100 on a weight basis for all measurements. When the pH was decreased below 5.0, there was a progressive change in the composition of the spectra, which contained three distinct components that were similar to those seen in the absence of sulfide; i.e., a sextet from magnetically-dilute Fe(III) and doublets from Fe(II) and Fe(III). There was, however, a higher proportion of the iron as Fe(II) in the sulfide-containing solutions and this represented the only form of iron at very low pH. Establishment of equilibria was slow as evidenced by considerable hysteresis between the compositions of the solutions with decreasing and increasing pHs. On increasing the pH, sulfide prevented the formation of magnetically dilute Fe(III) species and instead, in the range 3.5–6.0, compounds were generated with parameters consistent with sulfur being coordinated to the iron. One had parameters similar to those of pyrite and hence probably contains disulfide (S2 2−) units, whilst a second, with poorly defined magnetic hyperfine splitting, may contain monosulfide (S2−) units, with structures related to either pyrrhotite (Fe1−x S) or greigite (Fe3S4). A third component probably corresponds to a mononuclear low spin Fe(II) complex, involving sulfur and fulvic acid in the iron coordination sphere. These species were oxygen-sensitive and decomposed to yield magnetically dilute Fe(III) complexes and Fe(III) oxyhydroxides on aeration of the solutions.
Starting Page	549
Ending Page	558
Page Count	10
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	141
Issue Number	3-4
e-ISSN	15729540
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Surfaces and Interfaces, Thin Films Nuclear Physics, Heavy Ions, Hadrons Atoms, Molecules, Clusters and Plasmas Condensed Matter
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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