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首页> 外文期刊>Environmental earth sciences >Distribution characteristics and pollution assessment of soil heavy metals over a typical nonferrous metal mine area in Chifeng, Inner Mongolia, China
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Distribution characteristics and pollution assessment of soil heavy metals over a typical nonferrous metal mine area in Chifeng, Inner Mongolia, China

机译：内蒙古赤峰市典型有色金属矿区土壤重金属的分布特征及污染评价

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摘要

The spatial distribution characteristics of heavy metals (As, Cd, Cu, Pb, and Zn) in a typical lead-zinc mine located in Inner Mongolia were studied by applying mathematical statistics and the ArcGIS spatial interpolation analysis. The Nemerow index and potential ecological-risk index were applied to the pollution assessment of heavy metals from the soil in accordance with the Environmental Quality Standard for Soils of China (grade 2) and background value for heavy metals. Results indicated that the average concentrations of As, Cd, Cu, Pb, and Zn were 82.39, 1.01, 33.47, 96.47, and 254.64mgkg(-1), respectively, and these values were higher than the regional background values in the studied scale. The average single-factor index (P-i) values of As, Cd, Cu, Pb, and Zn were 6.46, 6.61, 1.81, 3.93, and 4.02, respectively, when the regional background value was used as the assessment standard. Based on the Nemerow pollution index (P-N), all areas over the mine were in moderate or heavy pollution. The result of potential ecological-risk assessment showed that the mining-activity area and its surrounding areas were in the moderate risk level or above. Pollution was concentrated in the centre mining-activity area of tailing reservoir, concentrator, and waste dumps. The degree of heavy-metal pollution decreased with increased distance from the mining-activity area.
机译：应用数学统计和ArcGIS空间插值分析技术，研究了内蒙古典型铅锌矿中重金属（As，Cd，Cu，Pb和Zn）的空间分布特征。根据中国土壤环境质量标准（2级）和重金属背景值，将Nemerow指数和潜在的生态风险指数应用于土壤中重金属的污染评估。结果表明，As，Cd，Cu，Pb和Zn的平均浓度分别为82.39、1.01、33.47、96.47和254.64mgkg（-1），在研究规模中高于区域本底值。 。当使用区域背景值作为评估标准时，As，Cd，Cu，Pb和Zn的平均单因素指数（P-i）值分别为6.46、6.61、1.81、3.93和4.02。根据Nemerow污染指数（P-N），该矿的所有区域均为中度或重度污染。潜在的生态风险评估结果表明，采矿活动区及其周边地区处于中等风险水平或以上。污染集中在尾矿库，选矿厂和废物场的中心采矿活动区。重金属污染程度随着距采矿活动区距离的增加而降低。

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