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. 2014 Apr 23;12(3):435–441. doi: 10.1007/s10311-014-0468-0

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© The Author(s) 2014

Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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Fig. 1 — Relative proportion of extractability from bottom sediments of Bukowno–Bolesław mining/smelting area. Light grey area corresponds to the sampling site Buk 2 pond, and dark grey area to the Buk 3 pond. Extractable fraction corresponds to the sequential extraction carried out using hydrogen peroxide (dark blue, dashed pattern) and acetic acid (light blue, without pattern). Values are given in per cent (%) of total content. High extractability could be observed for Cd, Pb and Zn in contrast with the low extractability reached for As, Cr, and Mo, indicating different mechanism of mobilisation for these elements. The data were plotted using GraphPad Prism 5.0 for Mac OS-X (GraphPad Software Inc., 2007). (Color figure online)