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Paikaray, Susanta ; Peiffer, Stefan:
Lepidocrocite Formation Kinetics from Schwertmannite in Fe(II)-Rich Anoxic Alkaline Medium.
In: Mine Water and the Environment.
Bd. 34
(2015)
.
- S. 213-222.
ISSN 1616-1068
DOI: https://doi.org/10.1007/s10230-014-0309-1
Abstract
Effect of dissolved ferrous iron [Fe(II)aq = 0–1.0 mM] on stability of schwertmannite containing ≈40 wt% Fe(III) and 15 wt% SO4 2− [with and without 0.92 wt% sorbed As(III)] was investigated in anoxic alkaline conditions at pH 8 for 154 h. New product formation, sulfate, iron, and arsenic release kinetics were examined using diffractogram, microscopic, spectroscopic and geochemical techniques. Both schwertmannite types were incompletely transformed to lepidocrocite with a platy tabular morphometry. Product formation was accelerated with increased Fe(II)aq, while sorbed As(III) markedly hindered lepidocrocite formation. Almost 50–57 % of the SO4 2− was released from schwertmannite within 154 h in the absence of Fe(II)aq, while its presence inhibited its release. Some of the sorbed As(III) was released during lepidocrocite formation with a maximum in the presence of 1.0 mM Fe(II)aq (0.02 %, 21 µg L−1), presumably due to catalytic action of Fe(II)aq on schwertmannite dissolution, which likely re-precipitated as lepidocrocite with considerable surface-adsorbed SO4 2−.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Keywords: | Lepidocrocite Formation Kinetics; Schwertmannite; Fe(II)-Rich Anoxic Alkaline Medium |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Hydrologie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Hydrologie > Lehrstuhl Hydrologie - Univ.-Prof. Dr. Stefan Peiffer |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie |
| Eingestellt am: | 23 Apr 2025 07:59 |
| Letzte Änderung: | 23 Apr 2025 07:59 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/93338 |