Details

Autor(en) / Beteiligte

• Zimmer, Dana
• Kruse, Jens
• Baum, Christel
• Borca, Camelia
• Laue, Michael
• Hause, Gerd
• Meissner, Ralph
• Leinweber, Peter

Titel

Spatial distribution of arsenic and heavy metals in willow roots from a contaminated floodplain soil measured by X-ray fluorescence spectroscopy

Ist Teil von

• The Science of the total environment, 2011-09, Vol.409 (19), p.4094-4100

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2011

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• Under changing redox conditions some plants create plaques at their root surface, which may affect the mobility and uptake of As and heavy metals but it is unknown to what extent this also holds true for willows in contaminated floodplain soils. Therefore, willow roots were sampled from a phytoremediation trial in the contaminated floodplain of the river Elbe (Germany), cryofixed, freeze-dried, and cross sections were mapped for the distribution of As, Ca, Cu, Fe, K, Mn, Ni, S and Zn by synchrotron based X-ray fluorescence spectroscopy. The elements Ca, Cu, Ni, S and Zn were concentrated in the aerenchymatic tissue, and not associated with Fe and Mn. Mixed Fe–Mn plaques covered the surface of the willow roots and As was accumulated in these plaques. The observed association pattern between As and Fe was explained by the different sorption/desorption properties of As(III) and As(V). The Cu and Zn intensities were not associated with the intensity of Fe in the plaque, which seems to be a willow-specific difference compared to other wetland plants. These results suggested that willows are especially suited to stabilize low-phytoextractable elements like Cu and As in their roots and rhizosphere. Thus, short rotation coppicing of willows may be a practical approach to mitigate the adverse effects of floodplain soil contamination. ► Elemental distributions were mapped on willow roots for the first time by synchrotron-based X-ray fluorescence. ► Ca, Cu, Ni, S and Zn were enriched in the aerenchyma but As, Fe and Mn formed root plaques. ► The Cu and Zn enrichments in aerenchyma but absence in plaques appeared to be willow-specific. ► In the plaques were three groups of pixels which strongly differed in the As to Fe and As to Mn ratios. ► This indicated different species of these redox-sensitive elements.