Econ. Environ. Geol. 2008; 41(4): 405-425

Published online August 31, 2008

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

The Behavior of Dissolved and Particulate Phases of Trace Elements within the Watershed of Juam Reservoir

Pyeong-Koo Lee1*, Se-Jung Chi2 and Seung-Jun Youm1

1Geological and Environmental Hazards Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea
2Geology & Geoinformation Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea

Correspondence to :

Pyeong-Koo Lee

pklee@kigam.re.kr

Received: July 16, 2008; Accepted: August 18, 2008

Abstract

In order to investigate the amounts of trace elements flowing into reservoir, and to elucidate the relationship between trace element mobility and fraction size, the stream water and sediment samples were collected from thirty-two sites of the 3rd or 4th order stream within watershed surrounding the Juam reservoir. Chemical analyses of trace elements (As, Cd, Cr, Cu, Ni, Pb and Zn) for all samples were completed, and additionally cationi and anion for stream water samples. Considering the distribution of rocks and contamination sources in watershed, the eight stream sediments were selected from typical sites representing study areas, and we determined the concentrations of trace elements according to size fractions (2 mm~200 μm, 200~100 μm, 100~50 μm, 50~20 μm and < 20 μm). The correlation relationships between concentrations and size fractions of stream sediments were important to identify the hydro-geochemical behavior of trace elements that flow into Juam reservoir. Stream waters showed four water types (Ca-Mg-HCO3, Ca-Na-HCO3-Cl, Ca-Na-HCO3-SO4, Ca-Na-HCO3) depending on pollution sources such as coal mine, metal mine, farm-land and dwellings. Concentrations of trace elements increased clearly with the decrease in size fractions of stream sediments. Concentrations of Cu, Pb and Zn increased dramatically in silt size (< 20 μm) fraction, while As had high concentrations in sand size (2 mm~100 μm) fraction in downstream sediments of metal mines.
These indicate that Cu, Zn, and Pb moved into Juam reservoir easily in the adsorbed form on silt size grain in sediments, and As was transported as As-bearing mineral facies, resulting in its less chance to reach into Juam reservoir.

Keywords stream sediments, size analyses, behavior of trace elements

Article

Econ. Environ. Geol. 2008; 41(4): 405-425

Published online August 31, 2008

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

The Behavior of Dissolved and Particulate Phases of Trace Elements within the Watershed of Juam Reservoir

Pyeong-Koo Lee1*, Se-Jung Chi2 and Seung-Jun Youm1

1Geological and Environmental Hazards Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea
2Geology & Geoinformation Division, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea

Correspondence to:

Pyeong-Koo Lee

pklee@kigam.re.kr

Received: July 16, 2008; Accepted: August 18, 2008

Abstract

In order to investigate the amounts of trace elements flowing into reservoir, and to elucidate the relationship between trace element mobility and fraction size, the stream water and sediment samples were collected from thirty-two sites of the 3rd or 4th order stream within watershed surrounding the Juam reservoir. Chemical analyses of trace elements (As, Cd, Cr, Cu, Ni, Pb and Zn) for all samples were completed, and additionally cationi and anion for stream water samples. Considering the distribution of rocks and contamination sources in watershed, the eight stream sediments were selected from typical sites representing study areas, and we determined the concentrations of trace elements according to size fractions (2 mm~200 μm, 200~100 μm, 100~50 μm, 50~20 μm and < 20 μm). The correlation relationships between concentrations and size fractions of stream sediments were important to identify the hydro-geochemical behavior of trace elements that flow into Juam reservoir. Stream waters showed four water types (Ca-Mg-HCO3, Ca-Na-HCO3-Cl, Ca-Na-HCO3-SO4, Ca-Na-HCO3) depending on pollution sources such as coal mine, metal mine, farm-land and dwellings. Concentrations of trace elements increased clearly with the decrease in size fractions of stream sediments. Concentrations of Cu, Pb and Zn increased dramatically in silt size (< 20 μm) fraction, while As had high concentrations in sand size (2 mm~100 μm) fraction in downstream sediments of metal mines.
These indicate that Cu, Zn, and Pb moved into Juam reservoir easily in the adsorbed form on silt size grain in sediments, and As was transported as As-bearing mineral facies, resulting in its less chance to reach into Juam reservoir.

Keywords stream sediments, size analyses, behavior of trace elements

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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