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Arsenic Distribution and Solubility in Groundwater of Okcheon Area  

Chon, Chul-Min (Korea Institute of Geoscience and Mineral Resources)
Kim, Kue-Young (Korea Institute of Geoscience and Mineral Resources)
Koh, Dong-Chon (Korea Institute of Geoscience and Mineral Resources)
Choi, Mi-Jung (GeoGreen21 Co., Ltd.)
Publication Information
Journal of the Mineralogical Society of Korea / v.22, no.4, 2009 , pp. 331-342 More about this Journal
Abstract
Groundwater samples were collected from the bedrock aquifers related with Okcheon metasedimentary rocks. Arsenic (As) concentrations in the samples varied between 0.0051 and 0.887 mg/L, with an average of 0.0248. Cations and anions of groundwaters had no relationship with As contents as well as with spatial distribution of geology in the area. Pyrite, chalcopyrite and arsenopyrite in the core samples of the monitoring wells were identified in thin section, X-ray diffraction (XRD) and electron probe microscope analysis (EPMA). It was suggested that these minerals are responsible for the As in groundwater. The groundwater showed saturations with respect to calcite $(CaCO_3)$, dolomite (CaMg$(CO_3)_2$) and Magnesite $(MgCO_3)$. $HAsO_4{^{2-}}$ activities in the groundwater samples were close to $Ca_3(AsO_4)_2(c)$ and $Mn_3(AsO_4)_2(c)$ solubility isotherms, indicating that the maximum As contents in groundwater are secondly controlled by the precipitation and dissolution of carbonate minerals due to alkaline and oxic nature of the groundwater (pe+pH>10).
Keywords
arsenic; groundwater; solubility; PHREEQC; Okcheon metasedimentary rocks; calcium arsenate $Ca_3(AsO_4)_2(c)$;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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