Transport and sediment-water partitioning of trace metals in acid mine drainage: An example from the abandoned Kwangyang Au-Ag mine area, South Korea

Hun Bok Jung, Seong Taek Yun, Bernhard Mayer, Soon Oh Kim, Seong Sook Park, Pyeong Koo Lee

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Transport and sediment-water partitioning of trace metals (Cr, Co, Fe, Pb, Cu, Ni, Zn, Cd) in acid mine drainage were studied in two creeks in the Kwangyang Au-Ag mine area, southern part of Korea. Chemical analysis of stream waters and the weak acid (0.1 N HCl) extraction, strong acid (HF-HNO 3-HClO4) extraction, and sequential extraction of stream sediments were performed. Heavy metal pollution of sediments was higher in Chonam-ri creek than in Sagok-ri creek, because there is a larger source of base metal sulfides in the ores and waste dump upstream of Chonam-ri creek. The sediment-water distribution coefficients (K d) for metals in both creeks were dependent on the water pH and decreased in the order Pb ≈ Al > Cu > Mn > Zn > Co > Ni ≈ Cd. K d values for Al, Cu and Zn were very sensitive to changes in pH. The results of sequential extraction indicated that among non-residual fractions, Fe-Mn oxides are most important for retaining trace metals in the sediments. Therefore, the precipitation of Fe(-Mn) oxides due to pH increase in downstream sites plays an important role in regulating the concentrations of dissolved trace metals in both creeks. For Al, Co, Cu, Mn, Pb and Zn, the metal concentrations determined by 0.1 N HCl extraction (Korean Standard Method for Soil Pollution) were almost identical to the cumulative concentrations determined for the first three weakly-bound fractions (exchangeable + bound to carbonates + bound to Fe-Mn oxides) in the sequential extraction procedure. This suggests that 0.1 N HCl extraction can be effectively used to assess the environmentally available and/or bioavailable forms of trace metals in natural stream sediments.

Original languageEnglish
Pages (from-to)437-449
Number of pages13
JournalEnvironmental Geology
Volume48
Issue number4-5
DOIs
Publication statusPublished - 2005 Aug

Keywords

  • 0.1 N HCl extraction
  • Acid mine drainage
  • Distribution coefficient
  • Kwangyang mine, South Korea
  • Sequential extraction
  • Stream sediment
  • Trace metals

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Pollution
  • Soil Science

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