摘要
以某典型锰矿区域的土壤、尾矿库和河流沉积物为研究对象,分析了重金属污染状况,并进行污染状况和潜在生态危害评价。结果表明:研究区域土壤、尾矿库和河流沉积物样品中,Cu、Zn、Ni、Pb、Cr和Hg的平均含量为41.52 mg/kg、169.49 mg/kg、42.11 mg/kg、33.52 mg/kg、65.27 mg/kg和2.68 mg/kg。单因子污染指数法结果表明,锰矿区土壤样品中,6种重金属元素的污染大小依次为Hg>Ni>Cu>Zn>Cr>Pb,Hg处于中度污染水平,Ni处于警戒线水平,其余点位处于清洁水平。内梅罗综合污染指数法分析结果表明,研究区域土壤平均指数为2.05,处于中度污染水平。潜在的生态风险指数评估结果表明,研究区域土壤、尾矿库和河流沉积物样品中6种重金属的综合潜在生态风险指数值为52.04~1688.54,平均值为370.39,研究区域中重金属潜在生态风险指数平均值处于轻微生态风险等级。
This paper selectes the soil, tailings and river sediment of a certain typical manganese ore area as the research object, analyzes the status of heavy metal pollution, and evaluates the potential ecological risk of heavy metals. The results showed that the average content of Cu, Zn, Ni, Pb, Cr and Hg were 41.52 mg/kg, 169.49 mg/kg, 42. 11 mg/kg, 33.52 mg/kg, 65.27 mg/kg and 2. 68 mg/kg in the study area＇ s soil, tailings and river sediment samples, respectively. Evaluation results of single factor pollution index method showed that the pollution level of six heavy metal elements was Hg 〉 Ni 〉 Cu 〉 Zn 〉 Cr 〉 Pb in the mine area, while Hg was at the moderate pollution level, Ni was at the alarming level, and the rest points were at the clean level. Furthermore, the results of Nemerow comprehensive pollution index method showed that the average index was 2.05 in the study area soil, which was at the moderate pollution level. The results of potential ecological risk index evaluation showed that the potential ecological risk index of six heavy metals had values from 52.04 to 1688.54 in the soil, tailings and river sediment samples. The average potential ecological risk was 370.39, which indicated the slight ecological hazard in the study area.
出处
《环境影响评价》
2017年第4期66-70,84,共6页
Environmental Impact Assessment
基金
重庆市社会事业与民主保障科技创新专项基金资助项目(cstc2015shmszx0042)
关键词
锰矿区域
重金属
分布特征
潜在风险评价
manganese ore area
heavy metal
distribution characteristics
potential ecological risk evaluation
