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Natural radionuclides in trees grown on a uranium mill tailings waste pile

  • Marko Štrok
  • Borut Smodiš
  • Klemen Eler
Research Article

Abstract

Objective

The purpose of the study was to investigate natural radionuclide uptake and allocation by trees.

Materials and methods

Samples from six Scots pines (P. sylvestris), six Norway spruces (Picea abies) and one sycamore maple (Acer pseudoplatanus) tree, growing on the Boršt uranium mill tailings waste pile in Slovenia were collected. 238U, 230Th, 226Ra and 210Pb activity concentrations in wood, shoots and 1-year-old needles or leaves were determined. Particular radionuclides were separated from the samples by appropriate radiochemical procedures and their activity concentrations measured with an alpha spectrometry system. In addition, concentration ratios for different plant parts were calculated.

Results and conclusions

Results showed that for all radionuclides, the highest activity concentrations were found in foliage, followed by shoots and wood. The activity concentrations in trees were from 0.01 to 5.4 Bq kg−1 for 238U, 0.03–11.3 Bq kg−1 for 230Th, 2.7–2,728 Bq kg−1 for 226Ra and 5.1–321 Bq kg−1 for 210Pb. All activity concentrations were calculated on dry weight basis. The calculated concentration ratios were from 1.05E-5 to 5.39E-3 for 238U, 7.65E-6–2.88E-3 for 230Th, 3.10E-4–3.16E-1 for 226Ra and 6.70E-4–4.22E-2 for 210Pb.

Keywords

Natural radionuclides Pinus sylvestris Picea abies Acer pseudoplatanus Uranium mill tailings Alpha spectrometry 

Notes

Acknowledgements

We would like to thank the staff of the Rudnik Žirovski vrh Company for their cooperation and assistance. The financial support of the Slovenian Research Agency (Grant No. P2-0075) is highly appreciated.

References

  1. Flynn WW (1968) The determination of low levels of polonium-210 in environmental materials. Anal Chim Acta 43:221–227CrossRefGoogle Scholar
  2. Haas G, Schupfner R, Müller A (1995) Uptake and long term behaviour of naturally occurring radionuclides in tree rings of spruce. J Radioanal Nucl Chem 194:283–289CrossRefGoogle Scholar
  3. Hinton TG, Knox AS, Kaplan DI, Sharitz R (2005) Phytoextraction of uranium and thorium by native trees in a contaminated wetland. J Radioanal Nucl Chem 264:417–422CrossRefGoogle Scholar
  4. Horwitz EP, Dietz ML, Chiarizia R, Diamond H, Essling AM, Graczyk D (1992) Separation and preconcentration of uranium from acidic media by extraction chromatography. Anal Chim Acta 266:25–37CrossRefGoogle Scholar
  5. Horwitz EP, Chiarizia R, Dietz ML, Diamond H, Nelson DM (1993) Separation and preconcentration of actinides from acidic media by extraction chromatography. Anal Chim Acta 281:361–372CrossRefGoogle Scholar
  6. ISO 11464:1994(E) (1994) Soil quality—pretreatment of samples for physico-chemical analyses. International Organization for Standarisation, GeneveGoogle Scholar
  7. Jia G, Torri G, Innocenzi P (2004) An improved method for the determination of uranium isotopes in environmental samples by alpha-spectrometry. J Radioanal Nucl Chem 262:433–441CrossRefGoogle Scholar
  8. Križman M, Byrne AR, Benedik L (1995) Distribution of 230Th in milling wastes from the Žirovski vrh uranium mine (Slovenia), and its radioecological implications. J Environ Radioact 26:223–235CrossRefGoogle Scholar
  9. Lozano JC, Fernandez F, Gomez JMG (1997) Determination of radium isotopes by BaSO4 coprecipitation for the preparation of alpha-spectrometric sources. J Radioanal Nucl Chem 223:133–137CrossRefGoogle Scholar
  10. Madruga MJ, Brogueira A, Alberto G, Cardoso F (2001) 226Ra bioavailability to plants at the Urgeiriça uranium mill tailings site. J Environ Radioact 54:175–188CrossRefGoogle Scholar
  11. Official Gazette of the Republic of Slovenia (2004) Decree on activities involving radiation. 48/2004 (in Slovene)Google Scholar
  12. Petrova R (2006) Accumulation of natural radionuclides in wooden and grass vegetation from abandoned uranium mines. Opportunities for phytoremediation. In: Merkel BJ, Hasche-Berger A (eds) Uranium in the environment, mining impact and consequences. Springer, Berlin, pp 507–518Google Scholar
  13. Rodríguez PB, Tomé FV, Lozano JC, Fernández MAP (2010) Transfer of 238U, 230Th, 226Ra, and 210Pb from soils to tree and shrub species in a Mediterranean area. Appl Radiat Isot 68:1154–1159CrossRefGoogle Scholar
  14. Sill CW (1961) Decomposition of refractory silicates in ultramicro analysis. Anal Chem 33:1684–1686CrossRefGoogle Scholar
  15. Thiry Y, Schmidt P, Hees MV, Wannijn J, Bree PV, Rufyikiri G, Vandenhove H (2005) Uranium distribution and cycling in Scots pine (Pinus sylvestris L.) growing on a revegetated U-mining heap. J Environ Radioact 81:201–219CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  1. 1.Jožef Stefan InstituteLjubljanaSlovenia
  2. 2.Biotechnical FacultyUniversity of LjubljanaLjubljanaSlovenia

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