| .神木矿区土壤重金属含量特征及潜在风险评价[J].农业环境科学学报,2013,32(6):. |
| 神木矿区土壤重金属含量特征及潜在风险评价 |
| Contents of soil heavy metals and evaluation on the potential pollution risk in Shenmu Mining Area |
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| DOI：10.11654/jaes.2013.06.010 |
| 中文关键词: 土壤重金属 土壤污染 生态风险 神木矿区 |
| 英文关键词: soil heavy metal soil pollution ecological risk Shenmu Mining Area |
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| 摘要点击次数: 2095 |
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| 中文摘要: |
| 通过对神府煤田开采区2个典型煤矿周围土壤0~60 cm土层镉（Cd）、铜（Cu）、锌（Zn）、铬（Cr）、铅（Pb）含量进行测定，分析了煤矿周围土壤重金属含量随深度的变化趋势，评价了煤矿开采对周围土壤的重金属污染程度和潜在生态风险。结果表明：（1）两个煤矿周围土壤重金属含量随深度变化的趋势基本相同，但变化幅度有明显差异，四道沟煤矿土壤中重金属含量大于凉水井煤矿；（2）凉水井和四道沟煤矿土壤中Cd含量平均值均超过国家一级标准土壤背景值，分别为0.40 mg·kg-1和0.47 mg·kg-1，四道沟煤矿的污染程度较凉水井煤矿严重，说明小型煤矿的开采对环境的污染更明显；（3）两个煤矿周围土壤综合污染程度在9.71~13.61之间，处于中等污染水平，其中凉水井煤矿平值为10.11，四道沟煤矿平值为11.39，单项重金属污染系数平均值从高到低顺序为Cd＞Zn＞Cu＞Pb＞Cr，其中Cd的平均污染系数值为5.43，处于高污染水平；（4）两个煤矿周围土壤生态风险指数值范围在104.83~144.75之间，其中凉水井煤矿平均值为115.51，四道沟煤矿平均值为133.53，均处于低风险水平，但最大值已经接近中等风险程度，从单种污染元素来看，Cd的生态风险系数范围为87.5～132.5，生态风险达到较高程度。研究结果可为矿区土壤环境质量评价工作及煤矿周围土壤重金属污染的综合治理提供科学依据。 |
| 英文摘要: |
| In recent years, considerable attention has been paid to the problem of soil contamination with heavy metals to prevent further environmental deterioration and to examine applicable methods of soil remediation. In this case study, the contents and vertical distribution of heavy metals（Cd, Cu, Zn, Cr, Pb） in soils around two collieries in Shenfu Coal Mine Area were analyzed, and the pollution degree and potential ecological risks of the heavy metals were evaluated by the Potential Ecological Risk Index. The results indicated that（1）The change trends of heavy metals in the 0~60 cm soil profile were similar between two collieries, and the content of soil heavy metals in Sidaogou Colliery was higher than that of Liangshuijing Colliery;（2）The average contents of cadmium in soils surrounding two Collieries were higher than the national soil background value（0.20 mg·kg-1）, which were 0.40 mg·kg-1 in Liangshuijing Colliery and 0.47 mg·kg-1 in Sidaogou Colliery;（3）The values of（the comprehensive pollution degree） were 10.11 in Liangshuijing Colliery and 11.39 in Sidaogou Colliery respectively, indicating the comprehensive pollution degree was in middle-grade level. The single pollution index for different heavy metals had the following rule：Cd＞Zn＞Cu＞Pb＞Cr, and the corresponding value for cadmium was 5.43, indicating cadmium pollution was relatively serious in the soils of two collieries;（4）The total potential ecological risk factors varied in the range of 104.83~144.75, with mean values of 115.51 in Liangshuijing Colliery and 133.53 in Sidaogou Colliery, respectively, indicating the risk grade was in relatively low level. From the analysis of the single heavy metal element, the cadmium had the highest contribution to the potential ecological risk. This study will contribute new information about the potential pollution risk of soil heavy metals in Shenmu Mining Area, and it is predictable that those results could be helpful to protection of soils surrounding the collieries. |
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