汾河太原段土壤中Hg、Cr空间分布与污染评价

    Pollution assessment and spatial distribution of soil Hg and Cr in the Taiyuan area of the Fenhe River

    • 摘要: 为了探明汾河太原段土壤中Hg、Cr污染情况,在GIS支持下,运用地统计学方法,测定分析了汾河太原段两岸土壤中重金属Hg、Cr的含量和空间分布特征,采用单因子法对土壤中Cr、Hg的污染进行评价。结果表明:汾河太原段土壤中Hg含量高于山西省土壤背景值和中国土壤背景值,Cr含量与背景值相当;土壤中Hg和Cr半方差函数模型为高斯模型,属于空间中等程度相关,Hg和Cr有相似的空间分布格局,总体分布趋势为北中部和南部地区相对较高,北部和中南部相对较小;污染评价表明Hg污染较Cr污染严重,但所有土壤Hg含量均在国家土壤环境质量二级标准之内;土壤Hg、Cr污染防治应结合其空间分布格局和区域污染特征综合考虑。

       

      Abstract: Soil samples were collected from the Taiyuan area of the Fenhe River and analyzed to determine Hg and Cr concentrations. The spatial distribution of Hg and Cr in soils in this area was explored using the technologies of Geographic Information System and Geostatistic. Single Factor index was used to assess the pollution of Hg and Cr in urban soils of this area. The results show that the concentration of soil Hg in this area is higher than background concentration of that in Shanxi Province and China, while the concentration of soil Cr equals to the background concentration of that in Shanxi Province and China. The semi-variance model of Hg, Cr is Gauss model. The spatial self-correlations of Hg and Cr in soils in this area are moderately dependent and their spatial interpolation map revealed high concentration of Hg and Cr in the north-central and south parts of the region. The results of single factor index assessment show that Hg pollution is much more serious than that of Cr, however, the content of Hg is in the range of the second grade of the national standard for soil environmental quality (GB15618-1995). Various spatial distributions suggested that Hg and Cr pollution control should focus on their spatial character and local condition.

       

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