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Time-resolved XANES speciation studies of chromium on soils during simulated contamination |
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| Authors: | Kappen P Welter E Beck P H McNamara J M Moroney K A Roe G M Read A Pigram P J |
| Affiliation: | aCentre for Materials and Surface Science and Department of Physics, La Trobe University, Kingsbury Drive, Bundoora, Victoria 3086, Australia bHamburger Synchtoronstrahlungslabor HASYLAB at Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, Hamburg D-22607, Germany cEnvironmental Resources Management (ERM), 151 Clarendon Street, South Melbourne, Victoria 3205, Australia dDepartment of Innovation, Industry and Regional Development (DIIRD), L17/80 Collins Street, Melbourne, Victoria 3000, Australia |
| Abstract: | Time-resolved synchrotron X-ray absorption near edge structure (XANES) spectroscopy was used to study changes of chromium speciation in soils upon soil–water interaction. The time resolution was 30–45 min. In a flow-column apparatus operated near the synchrotron beamline, two different types of soil were treated with potassium-dichromate solution, and soil samples were taken and directly analysed by XANES. The results provide insight into different equilibrium times of a few hours, depending on the type of soil. The XANES speciation analyses, based on a model comprising insoluble Cr(III) and Cr(VI) compounds, show how the fate of Cr species on soils can be followed close to real-time. Since the method allowed the soils to be investigated close to real-time, sampling in the field and preservation before analysis were made redundant. This study benefits the development of corresponding in situ remediation techniques. |
| Keywords: | Chromium X-ray absorption spectroscopy XANES Speciation In situ Contamination Soil Remediation Time-resolved |
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