【摘要】 为了查清毛集试验区采煤塌陷区周边农田土壤重金属元素Cu、Zn、Ni、Cd、Cr和Pb含量与污染水平,选择新集一矿3处(A、B、C处)典型采煤塌陷区周边土壤为研究对象,通过系统采集23个土壤样品,利用火焰原子吸收分光光度法测定6种元素含量,并采用单项污染指数法和综合污染指数法开展重金属污染评价。结果表明:基于元素含量的空间分布规律,得出Cu与Zn、Pb与Cd、Ni与Cr具有相似污染源;土壤重金属二级超标率测定结果表明Cu、Pb、Ni、Cr未超标,而Cd和Zn普遍超标;元素的单项污染指数结果表明Ni含量达到警戒线,Zn达到轻度污染,而Cd达到重度污染; A、B、C处周边农田土壤的综合污染指数高低顺序为A>C>B。研究结果为毛集试验区内开展农用地重金属污染防控与修复提供了技术参考。更多还原

【Abstract】 In order to find out the contents and pollution levels of heavy metal elements( Cu,Zn,Ni,Cd,Cr and Pb) in farmland soils around coal mining subsidence areas in Maoji experimental area,three typical coal mining subsidence areas( A,B,C) around Xinji No.1 Mine were selected as research objects,23 soil samples were systematically collected,the contents of six kinds of elements were determined by flame atomic absorption spectrophotometry,and the single pollution index method and comprehensive pollution index method were used to carry out heavy metal pollution evaluation.The results show that based on the spatial distribution of element content,Cu and Zn,Pb and Cd,Ni and Cr have similar pollution sources; the two-level exceeding rate of soil metal elements shows that Cu,Pb,Ni and Cr do not exceed the standard,while Cd and Zn generally exceed the standard; the results of single pollution index of elements showed that Ni content reach the warning line,Zn reached slight pollution,and Cd reach severe pollution; the order of comprehensive pollution index of farmland soil around A,B and C is A>C>B.The results of this study will be beneficial to the prevention and remediation of heavy metal pollution in agricultural land in the region.更多还原