Econ. Environ. Geol. 2005; 38(5): 513-523

Published online October 31, 2005

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Effects of pH-Eh on Natural Attenuation of Soil Contaminated by Arsenic in the Dalchen Mine Area, Ulsan, Korea

Maeng-Eon Park1, Kyu-Youl Sung1*, Minhee Lee1, Pyeong-Koo Lee2 and Min-Chul Kim3

1Department of Environmental Geosciences, Pukyong National University, Busan 608-737, Korea
2Department of Geological and Environmental Hazards, Korea Institute of Geoscience and Mineral Resoureces, Daejeon 305-350, Korea
3Korea Agricultural & Rural Infrastructure Corporation, Euwang 437-703, Korea

Correspondence to :

Kyu-Youl Sung

geochemsky@hanmail.net

Received: August 9, 2005; Accepted: September 8, 2005

Abstract

The contamination of soils and groundwaters in the Dalcheon mine area, Ulsan, is investigated, and a natural attenuation capacity on redox and pH is evaluated. Arsenopyrite, the major source of arsenic pollution in the Dalcheon mine area, is contained up to 2% in tailings. Furthermore, As-bearing minerals such as loellingite, nicolite, rammelsbergite, gersdorffite, cobaltite and pyrite are also source of arsenic contamination, which show various concentration of arsenic each other. Surface of pyrite and arsenopyrite in tailings partly oxidized into Fe-arsenates and Fe-oxides, which means a progressive weathering process. There is no relationship between pH and arsenic content in groundwaters, otherwise Eh and arsenic concentration in unsaturated and saturated groundwater shows positive
relationship. RMB (Red Mud Bauxite) could be useful as a trigger on natural attenuation due to superior ability of removal capacity of arsenic when contaminated soil and groundwater in the Dalcheon mine area are remediated.

Keywords arsenic contamination, natural attenuation, pH-Eh, RMB, Dalcheon mine

Article

Econ. Environ. Geol. 2005; 38(5): 513-523

Published online October 31, 2005

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Effects of pH-Eh on Natural Attenuation of Soil Contaminated by Arsenic in the Dalchen Mine Area, Ulsan, Korea

Maeng-Eon Park1, Kyu-Youl Sung1*, Minhee Lee1, Pyeong-Koo Lee2 and Min-Chul Kim3

1Department of Environmental Geosciences, Pukyong National University, Busan 608-737, Korea
2Department of Geological and Environmental Hazards, Korea Institute of Geoscience and Mineral Resoureces, Daejeon 305-350, Korea
3Korea Agricultural & Rural Infrastructure Corporation, Euwang 437-703, Korea

Correspondence to:

Kyu-Youl Sung

geochemsky@hanmail.net

Received: August 9, 2005; Accepted: September 8, 2005

Abstract

The contamination of soils and groundwaters in the Dalcheon mine area, Ulsan, is investigated, and a natural attenuation capacity on redox and pH is evaluated. Arsenopyrite, the major source of arsenic pollution in the Dalcheon mine area, is contained up to 2% in tailings. Furthermore, As-bearing minerals such as loellingite, nicolite, rammelsbergite, gersdorffite, cobaltite and pyrite are also source of arsenic contamination, which show various concentration of arsenic each other. Surface of pyrite and arsenopyrite in tailings partly oxidized into Fe-arsenates and Fe-oxides, which means a progressive weathering process. There is no relationship between pH and arsenic content in groundwaters, otherwise Eh and arsenic concentration in unsaturated and saturated groundwater shows positive
relationship. RMB (Red Mud Bauxite) could be useful as a trigger on natural attenuation due to superior ability of removal capacity of arsenic when contaminated soil and groundwater in the Dalcheon mine area are remediated.

Keywords arsenic contamination, natural attenuation, pH-Eh, RMB, Dalcheon mine

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

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