Journal
CHEMOSPHERE
Volume 90, Issue 2, Pages 464-470Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2012.07.064
Keywords
Trace metals; Soil; Sewage sludge; Mn oxide; Diffusive gradients in thin-films; pH
Categories
Funding
- Dorothy Hodgkin Postgraduate Award [NE/C506999/1]
- National Basic Research Program of China [2008CB418203]
- Natural Environment Research Council [ceh010010] Funding Source: researchfish
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The two dimensional, small-scale, distribution of labile trace metals was investigated in a sandy loam soil historically treated with sewage sludge. After deployment of two DGT (diffusive gradients in thin-films) probes, their 1.8 x 15 cm windows were sliced into 5 x 5 mm and 5 x 8 mm rectangles to provide three vertical profiles with 5 mm resolution. Both sets of profiles showed sharp maxima of Mn, Cd, Co, Cu, Ni and Zn, which varied systematically, both vertically and horizontally. The observed mobilisation of metals was highly localised, as each measurement corresponded to a volume of soil as little as 25-40 mu L. Regression analysis indicated mobilisation of Cd, Co, Cu, Ni and Zn were strongly linked to mobilisation of Mn, while there was a strong linkage between Pb and Fe mobilisation. Localised reductive dissolution of Mn oxides or a localised lowering of pH were considered as possible mechanisms. (C) 2012 Elsevier Ltd. All rights reserved.
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