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

Park Maeng-Eon (Department of Environmental Geosciences, Pukyong National University)
Sung Kyu-Youl (Department of Environmental Geosciences, Pukyong National University)
Lee Minhee (Department of Environmental Geosciences, Pukyong National University)
Lee Pyeong-Koo (Department of Geological and Environmental Hazards, Korea Institute of Geoscience and Mineral Resources)
Kim Min-Chul (Korea Agricultural & Rural Infrastructure Corporation)
Publication Information
Economic and Environmental Geology / v.38, no.5, 2005 , pp. 513-523 More about this Journal
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;
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