湖南省某矿遗址周围农业土壤重金属污染及风险评价
Pollution and risk assessment of heavy metal in agricultural soil around an abandon mine site in Hunan Province
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摘要: 为了进一步了解湖南省某矿遗址周围农田土壤重金属的风险，在该矿遗址附近两个区域（Ⅰ区、Ⅱ区）采集125个农业土壤样品，分析其中重金属（As、Cd、Cr、Cu、Pb）的含量，运用综合污染评价法、潜在生态指数法和地积累指数法对其开展风险评估.结果表明，Ⅰ区农田土壤中As和Cd的含量比国家风险管控标准值高，属于中度污染土壤，存在着极高的潜在生态风险；地积累指数进一步指出Ⅰ区土壤中As污染属于二级污染、Cd污染属于四级污染.Ⅱ区农田土壤，除Cd的含量相对较高外，其它重金属含量均很低，该区域土壤重金属的综合污染评价值低于1.0.但是由于Ⅱ区土壤中Cd的地积累指数为1.92，表明Ⅱ区土壤受到Cd的轻度污染，存在一定的潜在风险.Abstract: To evaluate the risk of heavy metals pollution from arable soils in an abandon mine area in Hunan Province. Heavy metal contents (As, Cd, Cr, Cu, and Pb) in 125 agricultural soil samples collected from two investigation zones (named I and Ⅱ, respectively) around the mine area were analyzed. Three different risk assessment methods, including a comprehensive pollution assessment method, potential ecological index method and index of geo-accumulation (Igeo) were employed in the present study. According to the national risk management standards (NRMS) in farmland soils, the pollution status of As and Cd in the zone I was severe compared with zone Ⅱ, and the contamination status was conformed to the moderate pollution which indicated that the soils from zone I has a high potential ecological risk. Moreover, the Igeo values of heavy metals demonstrated that As and Cd pollution in the zone I are associated with secondary-grade pollution and fourth-grade pollution, respectively. As for zone Ⅱ, except for the relatively high content of Cd, the contents of other heavy metals (As, Cr, Cu, and Pb) were lower than the NRMS in agricultural soils. The comprehensive pollution evaluation value of heavy metals in zone Ⅱ was less than 1.0. However, the Igeo value of Cd in the soil of zone Ⅱ was 1.92, which indicated that the soil in zone Ⅱ is slightly polluted by Cd with a certain potential risk.
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Key words:
- abandon mine site /
- agricultural soil /
- heavy metal /
- risk assessment /
- ecological risk /
- Hunan Province
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