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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/104

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Title: Electron microprobe and synchrotron x-ray fluorescence mapping of the heterogeneous distribution of copper in high-copper vineyard soils
Authors: Jacobson, Astrid R.
Dousset, Sylvie
Andreux, Francis
Baveye, Philippe C.
Affiliation: University of Abertay Dundee. School of Contemporary Sciences
University of Abertay Dundee. SIMBIOS
Keywords: Microorganisms
Issue Date: Aug-2007
Publisher: American Chemical Society
Type: Article
Refereed: peer-reviewed
Rights: (C)American Chemical Society. Published version available from http://pubs.acs.org/doi/full/10.1021/es070707m
Citation: Jacobson, A.R. 2007. Electron microprobe and synchrotron x-ray fluorescence mapping of the heterogeneous distribution of copper in high-copper vineyard soils. Environmental Science and Technology. 41(18), pp. 6343–6349
Abstract: The response of microorganisms to metal contamination of soils varies significantly from one investigation to another. One explanation is that metals are heterogeneously distributed at spatial scales relevant to microbes and that microoorganisms are able to avoid zones of intense contamination. This article aims to assess the microscale distribution of Cu in a vineyard soil. The spatial distribution of Cu was measured at two resolutions (0.3 mm and 20 μm) in thin sections of the surface 4 cm of undisturbed soil by electron microprobe and synchrotron X-ray microfluorescence spectroscopy. Bulk physicochemical analyses of Cu, pH, organic matter, texture, and mineralogy were performed. The results indicate that the Cu distribution is strongly heterogeneous at both scales of observation. Entire regions of the thin sections are virtually devoid of Cu, whereas highly localized “hotspots” have Cu signal intensities thousands of times higher than background. The distribution of Rb, or Al and Si, indicators of clay minerals, or Fe (iron (hydr)oxides), show that Cu is not preferentially associated with these mineral phases. Instead, Cu hotspots are associated with particulate organic matter. These observations suggest modification of current sampling protocols, and design of ecotoxicological experiments involving microorganisms, for contaminated soils.
URI: http://hdl.handle.net/10373/104
Appears in Collections:Science Engineering & Technology Collection

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