科研之友
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摘要
In this paper, the downstream farmland soil in tailing pond of a certain uranium mine area of China was selected as the research object. We researched the distribution characteristics and correlation between heavy metals and radionuclides, and obtained major results as below: Through comparing with the background value of soil element in Jiangxi province, we can see that the contents of Cu, Cr, Zn, Pb and radionuclides including U-238, Ra-226 and Th-232 in soil all exceed the soil background value. The contents of U-238, Ra-226 Th-232 and Cu, Cr Zn generally exhibit a decreasing trend as the deepening depth of sampling point; Moreover as the distance between sampling point and tailings dam increases, the contents of such elements also show a generally decreasing trend; while the Pb content enjoys an unspecific change. In researched soil, U-238 is significantly related with Th-232, and for heavy metals, there are also several correlated groups such as Cu-Cr, Cu-Zn, Cu-Pb and Cr-Zn. Therefore, we can see that homology and combined pollution may exist between U-238 and Th-232, and correlations also exist among Cu, Cr, Zn and Pb, indicating the existence of homology and combined pollution within.
