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Environmental Earth Sciences

, Volume 65, Issue 4, pp 1309–1322 | Cite as

The distribution of total and methylmercury concentrations in soils near the Idrija mercury mine, Slovenia, and the dependence of the mercury concentrations on the chemical composition and organic carbon levels of the soil

  • Takashi Tomiyasu
  • Akito Matsuyama
  • Ryusuke Imura
  • Hitoshi Kodamatani
  • Junko Miyamoto
  • Yuriko Kono
  • David Kocman
  • Jože Kotnik
  • Vesna Fajon
  • Milena Horvat
Original Article

Abstract

Although the mining activity of the Idrija mine in Slovenia ceased in 1995, a large amount of mining dregs containing high concentrations of mercury remains in the area. The mining dregs were transported with river flow and deposition along the Idrija River. To estimate the dispersion and change in the chemical form of mercury, a total of 28 soil core samples were taken around the river. The individual core samples were separated into layers for the analysis of their chemical composition, carbon contents, total mercury (T-Hg) and methylmercury (MeHg) concentrations. The chemical composition measured by X-ray fluorescence spectrometry was useful to estimate the dispersion of tailings: the fluvial terrace soil had a chemical composition similar to that of the tailings and could be distinguished clearly from the forest soil. The highest T-Hg concentration, 1,100 mg kg−1, was observed in the fluvial terrace soil near the mine. Although the concentration decreased gradually along with distance from the mine, concentrations higher than 200 mg kg−1 of T-Hg were still observed in the fluvial terrace soil approximately 20 km downstream from the mine. In the vertical distribution of T-Hg in the hillslope soil, a higher value was observed in the upper layers, which suggests the recent atmospheric deposition of mercury. The concentration of MeHg was the lowest at the riverside and higher in the hillslope soil, which was the opposite of the T-Hg distribution. The total organic carbon content tracked similarly with the distribution of MeHg and a linear relation with a significantly high correlation coefficient was obtained. The distinction may be related to the different dispersion process of mercury, and the organic carbon contents may be an important factor for MeHg formation.

Keywords

Total mercury Methylmercury Idrija mercury mine Soil TOC XRF 

Notes

Acknowledgments

This work was supported by Grants-in-Aid (No.15404003 and No.18404001) for Scientific Research from the Japan Society for the Promotion of Science.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Takashi Tomiyasu
    • 1
  • Akito Matsuyama
    • 2
  • Ryusuke Imura
    • 1
  • Hitoshi Kodamatani
    • 1
  • Junko Miyamoto
    • 1
  • Yuriko Kono
    • 1
  • David Kocman
    • 3
  • Jože Kotnik
    • 3
  • Vesna Fajon
    • 3
  • Milena Horvat
    • 3
  1. 1.Graduate School of Science and EngineeringKagoshima UniversityKorimotoJapan
  2. 2.National Institute for Minamata DiseaseMinamataJapan
  3. 3.Department of Environmental SciencesInstitute Jožef StefanLjubljanaSlovenia

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