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| Titel |
Temperature dependence of hexavalent Cr reduction by natural organic matter in Cr(VI)-doped latosol soil |
| VerfasserIn |
Y.-L. Wei, H.-F. Hsieh, H. P. Wang |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250021990
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| Zusammenfassung |
| Cr(Ⅵ) reduction in natural organic matter (NOM)-bearing Latosol soil was investigated under various heating conditions at ≦105˚C. An enhanced Cr(Ⅵ) reduction level has been observed for the reaction at higher temperature, as well as for the reaction in liquid media. Cr(OH)3 was determined by X-ray absorption spectroscopy (XAS) as the key chromium species after about 90% Cr(VI) reduction. Solid-state 13C NMR results demonstrated that, after the Cr(VI) reduction, the aliphatic carbons, oxygenated aliphatic carbons, acetalic carbons, and carboxylic/carbonyl carbons of the NOM were dramatically oxidized; whereas most aromatic/phenolic carbons were quite resistant to the oxidation by Cr(VI). This study implies a potential remedy method by using the heat from industrial flue gas to chemically reduce Cr(VI) in NOM-bearing or organics-amended soils that has been contaminated with Cr(VI). |
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