Kim Myoung-Jin, Jung Yejin
Division of Civil and Environmental System Engineering, College of Engineering, Korea Maritime University, Busan, Korea.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2004;39(1):203-22. doi: 10.1081/ese-120027379.
In the present study, the vertical distributions (0-220 cm) of arsenic and heavy metals in mine tailings and nearby paddy fields, and their mobility through water-leach experiments were investigated. For the study, the area of Jingok mine located in Bongwha, Korea has been selected. The concentrations of arsenic and heavy metals in the mine tailings were extremely high compared to the paddy fields and control sites, i.e., up to 6675 mg/kg for As, 25 mg/kg for Cd, 22 mg/kg for Cr, 383 mg/kg for Cu, 11,135 mg/kg for Pb, 3600 mg/kg for Zn, 5.73 wt% for Fe, and 3.05 wt% for Mn. The concentrations of As and heavy metals in the paddy fields decreased sharply with increasing distance from the mine tailings, with values still higher than those in the control sites, indicating the contamination of the paddy fields by heavy metals released from the mine tailings. The vertical distributions of Cd, Cu, Pb, Al, Fe, and Mn showed the following common pattern: the highest values in the upper part of mine tailings (0-20 cm), rapid decrease with increasing depth, and then nearly constant values below the depth of 50 cm. Significant correlations were found between total Fe and heavy metals (Cd, Cu, and Pb), and between total Mn and heavy metals (Cd, Cu, Pb, and Zn) in the mine tailings, indicating that minerals containing Fe and Mn play an important role in the mobility of heavy metals such as Cd, Cu, Pb, and Zn. The fraction of As(V) ranged from 63 to 100% of total arsenic in the samples of the mine tailings. The high concentrations of total As, heavy metals, sulfate. hydrogen ion, and As(V) in the leachates of mine tailings suggest that sulfide minerals containing arsenic and heavy metals in the mine tailings were actively oxidized.
在本研究中，对尾矿和附近稻田中砷及重金属的垂直分布（0 - 220厘米）及其通过水浸实验的迁移性进行了调查。为此，选取了位于韩国奉化的井谷矿区域。尾矿中砷和重金属的浓度与稻田及对照点相比极高，即砷高达6675毫克/千克，镉25毫克/千克，铬22毫克/千克，铜383毫克/千克，铅11135毫克/千克，锌3600毫克/千克，铁5.73重量%，锰3.05重量%。稻田中砷和重金属的浓度随着与尾矿距离的增加而急剧下降，但仍高于对照点的值，表明尾矿释放的重金属对稻田造成了污染。镉、铜、铅、铝、铁和锰的垂直分布呈现出以下共同模式：在尾矿上部（0 - 20厘米）值最高，随深度增加迅速下降，然后在50厘米深度以下值几乎恒定。尾矿中总铁与重金属（镉、铜和铅）之间以及总锰与重金属（镉、铜、铅和锌）之间存在显著相关性，表明含锰和铁的矿物在镉、铜、铅和锌等重金属的迁移中起重要作用。尾矿样品中五价砷的比例占总砷的63%至100%。尾矿浸出液中总砷、重金属、硫酸盐、氢离子和五价砷的高浓度表明尾矿中含砷和重金属的硫化物矿物被积极氧化。
