宿州市城区主干道两侧土壤重金属分布特征与评价

Environmental Quality Evaluation of Heavy Metals Content in Soils on Both Sides of Main Road in Suzhou City

为了解宿州市城区主干道两侧土壤重金属污染情况,现对市区的37个采样点进行了采样分析。考虑到城市环境的复杂性,采样点在分布时兼顾了老城区和新兴城区,涵盖城区的内环和外环中的不同功能区。样品的测试结果表明,检测出的8种重金属元素中Cu的变异系数达到了108.58%,Ni的变异系数也有51.75%,两者平面分布差异最大。Fe、Zn、Co、Pb的含量超过了安徽省土壤背景值,Cu、Cr、Ni、Mn有部分采样点的含量超过了安徽省土壤背景值,超出采样点占比分别为59.46%、24.32%、8.10%、2.70%。所测重金属元素的Sufer分布图表明,Pb、Cr、Zn、Cu、Ni的高值区位于老城区,新兴城区并未出现异常富集。地质累积指数分析结果表明,Pb、Zn、Co、Ni、Mn、Cu的污染程度主要介于无污染到中度污染之间,对此应持谨慎态度,加强环境治理与监管。

In order to understand the pollution of heavy metals on both sides of main roads in Suzhou City, 37 sam. pling sites were sampled and analyzed. Considering the complexity of the urban environment, the sampling points were distributed in both old and emerging areas, covering different functional areas in the inner and outer rings of the old urban areas. The results showed that the coefficient of variation of Cu in the eight heavy metal elements was 108.58 and 51.75 respectively. The content of Fe,Zn,Co,Pb exceeded the soil background value of Anhui Province, and the content of Cu,Cr,Ni,Mn in some picking points exceeded the soil background value of Anhui Province. The Sufer map showed that the high numerical value area of Pb,Cr,Zn,Cu,Ni was located in the old urban area, but there was no abnormal enrichment in new district. The result of geological accumulation index analysis showed that the pol. lution degree of Pb,Zn,Co,Ni,Mn,Cu was mainly between non-pollution and moderate pollution, so we should be cau. tious about the pollution degree attitude, strengthen environmental governance and supervision.