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Thallium contamination of desert soil in Namibia: Chemical, mineralogical and isotopic insights

Z. Grösslová, A. Vaněk, V. Oborná, M. Mihaljevič, V. Ettler, J. Trubač, P. Drahota, V. Penížek, L. Pavlů, O. Sracek, B. Kříbek, A. Voegelin, J. Göttlicher, O. Drábek, V. Tejnecký, J. Houška, B. Mapani, T. Zádorová,

. 2018 ; 239 (-) : 272-280. [pub] 20180413

Language English Country England, Great Britain

Document type Journal Article

Persistent link   https://www.medvik.cz/link/bmc18033159

We studied arid desert soils from Namibia (Rosh Pinah) that were contaminated with up to 7 mg kg-1 of thallium (Tl) via dust emitted from a local flotation tailing dam. Chemical extractions of waste and soil materials indicated that most of the Tl is strongly bound, in accordance with X-ray diffraction and X-ray absorption spectroscopy data that point to the predominant association of Tl with metal sulfides and phyllosilicates. The isotope fractionation factor ε205Tl of the soil samples (from -0.4 to +3.8) shows a positive linear relationship (R2 = 0.62) with 1/Tl, indicative for the mixing of two major Tl pools, presumably anthropogenic Tl and geogenic Tl. The ε205Tl value for the topmost soil samples (∼+3) closely matches the ε205Tl value for post-flotation waste particles with a diameter of <0.05 mm, whereas the bulk flotation waste exhibits a significantly larger ε205Tl value (∼+6). These variations are in accordance with predominant atmospheric transfer of Tl from the tailings to the adjacent soils via fine (dust) particles. The identified minimal Tl alteration in soils indicates that only a small part of the Tl could be potentially released and passively enter the vegetation, local population and/or food chain in the long term. From this viewpoint, Tl does not represent such an important environmental concern as other (abundant) contaminants at the locality. Furthermore, there could be a relevance for other alkaline desert soils, including those where Tl pollution plays a major role.

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$a Grösslová, Zuzana $u Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic.
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$a Thallium contamination of desert soil in Namibia: Chemical, mineralogical and isotopic insights / $c Z. Grösslová, A. Vaněk, V. Oborná, M. Mihaljevič, V. Ettler, J. Trubač, P. Drahota, V. Penížek, L. Pavlů, O. Sracek, B. Kříbek, A. Voegelin, J. Göttlicher, O. Drábek, V. Tejnecký, J. Houška, B. Mapani, T. Zádorová,
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$a We studied arid desert soils from Namibia (Rosh Pinah) that were contaminated with up to 7 mg kg-1 of thallium (Tl) via dust emitted from a local flotation tailing dam. Chemical extractions of waste and soil materials indicated that most of the Tl is strongly bound, in accordance with X-ray diffraction and X-ray absorption spectroscopy data that point to the predominant association of Tl with metal sulfides and phyllosilicates. The isotope fractionation factor ε205Tl of the soil samples (from -0.4 to +3.8) shows a positive linear relationship (R2 = 0.62) with 1/Tl, indicative for the mixing of two major Tl pools, presumably anthropogenic Tl and geogenic Tl. The ε205Tl value for the topmost soil samples (∼+3) closely matches the ε205Tl value for post-flotation waste particles with a diameter of <0.05 mm, whereas the bulk flotation waste exhibits a significantly larger ε205Tl value (∼+6). These variations are in accordance with predominant atmospheric transfer of Tl from the tailings to the adjacent soils via fine (dust) particles. The identified minimal Tl alteration in soils indicates that only a small part of the Tl could be potentially released and passively enter the vegetation, local population and/or food chain in the long term. From this viewpoint, Tl does not represent such an important environmental concern as other (abundant) contaminants at the locality. Furthermore, there could be a relevance for other alkaline desert soils, including those where Tl pollution plays a major role.
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$a Vaněk, Aleš $u Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic. Electronic address: vaneka@af.czu.cz.
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$a Oborná, Vendula $u Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic.
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$a Mihaljevič, Martin $u Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 43, Prague 2, Czech Republic.
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$a Ettler, Vojtěch $u Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 43, Prague 2, Czech Republic.
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$a Trubač, Jakub $u Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 43, Prague 2, Czech Republic.
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$a Drahota, Petr $u Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov 6, 128 43, Prague 2, Czech Republic.
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$a Penížek, Vít $u Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic.
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$a Pavlů, Lenka $u Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic.
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$a Sracek, Ondra $u Department of Geology, Faculty of Science, Palacký University, 17. Listopadu 12, 771 46, Olomouc, Czech Republic.
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$a Kříbek, Bohdan $u Czech Geological Survey, Geologická 6, 152 00, Prague 5, Czech Republic.
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$a Voegelin, Andreas $u Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133, CH-8600, Duebendorf, Switzerland.
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$a Göttlicher, Jörg $u Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, KIT Campus North, Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany.
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$a Drábek, Ondřej $u Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic.
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$a Tejnecký, Václav $u Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic.
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$a Houška, Jakub $u Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic.
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$a Mapani, Benjamin $u Department of Geology, Faculty of Science, University of Namibia, Private Bag, 13301, Windhoek, Namibia.
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$a Zádorová, Tereza $u Department of Soil Science and Soil Protection, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Kamýcká 129, 165 00, Prague 6, Czech Republic.
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