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Environmental Geochemistry and Health

, Volume 24, Issue 3, pp 264–273 | Cite as

Assessment of Groundwater Quality and Contamination from Uranium-Bearing Black Shale in Goesan–Boeun Areas, Korea

  • N.C. WooEmail author
  • M.J. Choi
  • K.S. Lee
Article

Abstract

This study was initiated to identify the impact of metals and uranium enriched soil and black shale in groundwater quality and contamination. From a Piper diagram, groundwater was classified into four types as (Ca+Mg)−HCO3 type, (Ca+Mg)−SO4 type, the mixed type of these two and Na−HCO3 type, reflecting the complicated nature of geology of the study area. Silicate weathering appeared to be the major water–rock interaction. In groundwater, metals including Cr, Pb, Cu and V, previously identified as being enriched in soils and black shale, were much lower in concentrations than Korean and US EPA drinking water guidelines. Instead, Fe and Mn caused major water-quality problems. In the artesian groundwater from an abandoned uranium mine, the uranium concentration was 21.3 µg L−1, slightly higher than EPA guidelines of 20 µg L−1. Heavy metals in groundwater appeared to be controlled mostly by sorptions on to Fe- and Mn-oxyhydroxides. They could be remobilised in groundwater with changes of pH and Eh conditions due to acid mine drainage from black shale or the recharge of fresh water. Uranium would be associated with carbonate and sulphate complexes in groundwater. Because of the remaining water-quality problems in the study area, we suggested containment of identified mine wastes, considering remedial measures for local problems with Fe and Mn, continuous monitoring of groundwater and developing groundwater from deep aquifers.

black shale contamination groundwater quality Korea metal uranium 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  1. 1.Department of Earth System ScienceYonsei UniversitySeoulKorea
  2. 2.Korean Basic Science InstituteDaejonKorea

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