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| Titel |
The reduction of chromate ions by Fe(II) layered hydroxides |
| VerfasserIn |
S. Loyaux-Lawniczak, Ph. Refait, P. Lecomte, J.-J. Ehrhardt, J.-M. R. Génin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 3, no. 4 ; Nr. 3, no. 4, S.593-599 |
| Datensatznummer |
250001194
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| Publikation (Nr.) |
 copernicus.org/hess-3-593-1999.pdf |
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| Zusammenfassung |
| The reduction of chromate ions by Fe(OH)2
and the iron (II)-iron (III) hydroxysulphate green rust, GR(SO42-),
was studied to evaluate whether such synthetic layered hydroxides and the
corresponding natural green rust mineral could be involved in the natural
attenuation of contaminated environments. The resulting Cr (III) bearing phases,
which would govern the subsequent behaviour of chromium, were clearly
characterised. Both compounds proved to be very reactive and oxidised
instantaneously while chromate ions were reduced to Cr (III) as evidenced by
X-ray photoelectron spectroscopy. Mass balance (ICP-AES) demonstrated that the
Fe/Cr ratio inside the solid end product was equal to the initial Fe/Cr ratio.
The solid phases, analysed by X-ray diffraction, Raman and Mossbauer
spectroscopies were identified as Cr-substituted poorly crystallised iron (III)
oxyhydroxides in both cases, more precisely δ-FeOOH when starting with
Fe(OH)2 and ferrihydrite
when starting with GR(SO42-). |
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