Pedosphere 18(4): 464--478, 2008
ISSN 1002-0160/CN 32-1315/P
©2008 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Combined chemical and mineralogical evidence for heavy metal binding in mining-and smelting-affected alluvial soils |
| A. VANĚK1, V. ETTLER2, T. GRYGAR3, L. BORŮVKA1, O. ŠEBEK2 and O. DRÁBEK1 |
1 Department of Soil Science and Soil Protection, Czech University of Life Sciences Prague, Kamýcká 129, 165 21 Praha 6 (Czech Republic);
2 Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University, Albertov 6, 128 43 Praha 2 (Czech Republic);
3 Institute of Inorganic Chemistry, Analytical Laboratory, Academy of Sciences of the Czech Republic, 250 68 Řežu Prahy (Czech Republic) |
| ABSTRACT |
| The binding of metallic contaminants (Pb, Cd, and Zn) and As on soil constituents was studied on four highly con-taminated alluvial soil profiles from the mining/smelting district of Příbram (Czech Republic) using a combination of mineralogical and chemical methods. Sequential extraction analysis (SEA) was supplemented by mineralogical investi-gation of both bulk samples and heavy mineral fractions using X-ray diffraction analysis (XRD) and scanning electron microscopy with an energy dispersive X-ray spectrometer (SEM/EDS). The mineralogy of Fe and Mn oxides was studied by voltammetry of microparticles (VMP) and diffuse reflectance spectrometry (DRS). Zinc and Pb were predominantly bound in the reducible fraction attributed to Fe oxides and Mn oxides (mainly birnessite, Na4Mn14O27·9H2O), which were detected in soils by XRD and SEM/EDS. In contrast, Cd was the most mobile contaminant and was predominantly present in the exchangeable fraction. Arsenic was bound to the residual and reducible fractions (corresponding to Fe oxides or to unidentified Fe-Pb arsenates). SEM/EDS observations indicate the predominant affnity of Pb for Mn oxides, and to a lesser extent, for Fe oxides. Thus, a more suitable SEA procedure should be used for these mining-affected soils to distinguish between the contaminant fraction bound to Mn oxides and Fe oxides. |
| Key Words: alluvial soil, Fe and Mn oxides, heavy metals, mineralogy, mining |
| Citation: VanĚk, A., Ettler, V., Grygar, T., BorŮvka, L., Šebek, O. and DrÁbek, O. 2008. Combined chemical and mineralogical evidence for heavy metal binding in mining-and smelting-affected alluvial soils. Pedosphere. 18(4): 464-478. |
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