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| Characteristics and remediation strategy of heavy-metal polluted agricultural soil near a lead and zinc mine in Guangxi |
| Received:August 19, 2017 Revised:October 30, 2017 |
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| KeyWord:lead zinc mine;farmland soil;heavy metal pollution;remediation |
| Author Name | Affiliation | E-mail | | ZHANG Yun-xia | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | SONG Bo | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China
Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | songbo@glut.edu.cn | | YANG Zi-jie | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | WANG Fo-peng | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | ZHOU Lang | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | ZHOU Zi-yang | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | | | BIN Juan | College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541004, China | |
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| Abstract: |
| The aim of this study was to investigate the distribution characteristics of heavy metals in farmland areas affected by a lead-zinc mine and to explore remediation measures of polluted farmland. Heavy metal concentrations were surveyed using 41 background soil and 277 agricultural soil samples as well as 62 vegetable and 35 food samples collected near a lead-zinc mine in Guangxi Province. The results showed that the concentrations of heavy metals in soils were 4.500~104.8(As), 0.031~36.26(Cd), 24.80~2989(Pb), 16.90~251.6(Cu), 79.90~11 500(Zn), and 24.00~222.0(Cr) mg·kg-1, which exceeded the baseline values of the six heavy metals by 1.4%, 91.7%, 60%, 60%, 60%, and 0, respectively. The concentrations of As, Pb, and Cd in rice, and Pb and Cd in maize exceeded the Maximum Levels of Contaminants in Foods(MLC, GB 2762-2017) by 93%, 86%, 64%, 100%, and 100%, respectively. As, Pb, and Cd, exceeded the MLC by 50%, 100%, and 60% in leaf vegetables, 23%, 100%, and 100% in root vegetables, 23%, 100%, and 100% in root/stem vegetables, and 14%, 96%, and 100% in fruit vegetables, respectively. As, Pb, and Cd are thus the priority heavy metals for treatment. According to the spatial distribution characteristics of the surveyed heavy-metal pollutants in the area, three remediation strategies are recommended. In areas lightly polluted by Cd, the use of an activator and plant extracts to remove pollutants is recommended. In moderately polluted areas, the combination of a passivator with low-accumulating crops is recommended. In heavily polluted areas, the combination of an activator with hyperaccumulation plants is suggested, and main food crops should be avoided. |
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