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Characterization of Thorium Binding by Sequential Extractions in Uranium Tailings of Schneckenstein, Germany

  • Taoufik Naamoun
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

The chemical binding forms of Thorium in uranium tailings of Schneckenstein sites were investigated regarding a remediation strategy. A modified Tessier’s seven steps sequential extraction procedure was used for the fractionation of different classes of thorium species present in the sediments. The consecutive steps included leaching of the water-soluble thorium, liberation of thorium from exchange sites on inorganic soil constituents, extraction of carbonates bound species, release of specifically adsorbed thorium on manganese and iron oxides, removal of species associated with insoluble soil organic matter and sulfides and finally extraction of metal intrinsic in the soil matrix present in the structure of primary and secondary minerals. The results indicate that no thorium in the mobile phases. An appreciable amount of its total content is in the moderately reducible phase. Whereas, from 73 to 92% of the thorium is attached to clays and partly to resistant minerals.

Keywords

Resistant Mineral Reducible Phase Uranium Tailing Lithogenous Fraction High Precipitation Area 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. Barthel, F.H., (1993): Die Urangewinnung auf dem Gebiet der ehemaligen DDR von 1945 bis 1990, Geologisches Jahrbuch A142, Hannover.Google Scholar
  2. Boyle, R. W., (1982): Geochemical prospecting for thorium and uranium deposits, Develop. Econ. Geol., 16. Elsevier-Scientific Publ Co, Amsterdam-Oxford-New York, 498 pp.Google Scholar
  3. Janssen, R.P.T., et al., (1997a). Equilibrium partitioning of heavy metals in duch field soils, II: prediction of metal accumulation in earthworms. Environ. Toxicol. Chem. 16, pp. 2479–2488.Google Scholar
  4. Janssen, R.P.T., et al., (1997b). Equilibrium partitioning of heavy metals in duch field soils, I: relationship between heavy metal partition coefficients and soil characteristics. Environ. Toxicol. Chem. 16, pp. 2479–2488.CrossRefGoogle Scholar
  5. Kaufman, A., (1969): Thorium –232 concentration of surface ocean water. Geochim. Cosmochim. Acta, 33, pp. 717–24.CrossRefGoogle Scholar
  6. Knight, B., McGrath, S.P (1995). A method to buffer the concentrations of free Zn and Cd ions using a cation exchange resin in bacterial toxicity studies. Environ. Toxicol. 14, pp. 2033–2039.CrossRefGoogle Scholar
  7. Krishnamurti, G.S.R. & Naidu, R. (2003). Solid-solution equilibria of cadmium in soils. Geoderma 113, 17–30.CrossRefGoogle Scholar
  8. Langmuir, D. & Herman, J. S., (1980): The mobility of thorium in natural waters at low temperatures, Geochim. Cosmochim. Acta, 44, pp. 1753–1766.CrossRefGoogle Scholar
  9. Laxen, D.P.H. & Harrison, R.M. (1981). The physicochemical speciation of Cd, Pb, Cu, Fe and Mn in the final effluent of a sewage treatment works and its impact on speciation in receiving river. Water Res. 15, pp. 1053–1065.CrossRefGoogle Scholar
  10. Meers, E. et al. (2007). Comparison of cadmium extractability from soils by commonly used single extraction protocols. Geoderma 141, pp. 247–259.CrossRefGoogle Scholar
  11. Merkel et al., (1998): Natural leaching of uranium from the Schneckenstein Uranium mine Tailing, Uranium Mining and Hydrogeology II, Proc. Of the Intern. Conference and Workshop, Freiberg, Germany, Verlag Sven von Loga, Köln.Google Scholar
  12. Nriagu, J.O., (1996). A history of global metal pollution. Science pp. 272, 223.Google Scholar
  13. Parker, D.R. & Pedler, J.F., (1997). Reevaluating the free-ion activity model of trace metal availability to higher plants. Plant Soil 196, pp. 223–228.CrossRefGoogle Scholar
  14. Prokop, Z. et al., (2001). Mobility, bioavailability, and toxic effects of cadmium in soil samples. Environmental Research 91, pp. 119–126.CrossRefGoogle Scholar
  15. Salomons, W. & Forstner, U., (1984). Metals in the hydrocycle, Springer Verlag, Berlin-Heidelberg, 349 pp.CrossRefGoogle Scholar
  16. Salvarredyal-Aranguren, M.A. et al., (2008). Contamination of surface waters by mining wastes in the Milluni Valley (Cordillera Real, Bolivia). Mineralogical and hydrological influences. Applied Geochemistry 23, pp. 1299–1324.CrossRefGoogle Scholar
  17. Tack, F.M.G. Verloo, M.G. 1995. Chemical speciation and fractionation in soil and sediment heavy metal analysis. Journal of Environmental Analytical Chemistry 59, pp. 225–238.CrossRefGoogle Scholar
  18. Van Pejinenbur, W.J.G.M., et al., (1997). Conceptual framework for implementation of bioavailability of metals for environmental management purposes. Ecotoxicology and Environmental Safety 37, pp. 163–172.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Taoufik Naamoun
    • 1
  1. 1.Faculty of SciencesSfaxTunisia

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