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| Arsenic Contamination in Shimen Realgar Mine Ⅰ--As Spatial Distribution, Chemical Fractionations and Leaching |
| Received:March 16, 2015 |
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| KeyWord:Arsenic;mine tailings;farmland;surface water;chemical fraction;acid rain |
| Author Name | Affiliation | E-mail | | HU Yi-hong | College of Resources and Environment Science of Hunan Normal University, Changsha 410081, China | | | ZHOU Lei | College of Resources and Environment Science of Hunan Normal University, Changsha 410081, China | | | LI Xin | College of Resources and Environment Science of Hunan Normal University, Changsha 410081, China | | | XU Fan-di | College of Resources and Environment Science of Hunan Normal University, Changsha 410081, China | | | WANG Lin | College of Resources and Environment Science of Hunan Normal University, Changsha 410081, China | | | MO Dong-zhi | College of Resources and Environment Science of Hunan Normal University, Changsha 410081, China | | | ZHOU Liang | College of Resources and Environment Science of Hunan Normal University, Changsha 410081, China | | | WANG Xin | College of Resources and Environment Science of Hunan Normal University, Changsha 410081, China | hdhuanjing@163.com |
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| Abstract: |
| Shimen realgar mine, the largest realgar deposit in Asia, has caused the most severe arsenic(As) contamination in China, with an extremely high incidence of cancer in this area. In order to characterize As contamination in Shimen realgar mining area and thus provide the basis for environmental restoration and ecological health assessments, a systematical investigation on As spatial distribution, chemical fractionation and/or leaching of mine tailings, farmland soils and surface water in this area was carried out. Arsenic in the mine tailings was up to 10.3~389.3 g·kg-1, mainly as As2S3 crystal. Arsenic concentrations in the simulated acid rain extraction from the mine tailings were 16.5~84.0 mg·L-1. The upper layer of soils contained As up to 3.8~27.3 g·kg-1, with acid-rain dissoluble As of 0.1~0.6 mg·L-1. Due to As inputs from the subsurface runoff, As level in Huangshui River reached a peak value of 765 μg·L-1. Arsenic content in the farmland soils ranged from 43 to 2268 mg·kg-1, with the highest As spots distributed in fruit-growing area. Sequential extraction showed that water-soluble, surface adsorbed, Fe/Al associated, and carbonate bound As were c. 1.0%, 1.6%, 27.0% and 11.5% of total As, respectively. Under simulated acid rain and phosphate application, As in soil pore water was 0.03~4.6 mg·L-1. Taken together, the present study indicates that mine tailings with high As would become a critically important source of continuous As release into the surrounding soils and waters. |
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