Heavy metals pollution and potential ecological risk in paddy soils around historical mining plant in Yunnan Province
Received:April 26, 2016  Revised:April 26, 2016
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KeyWord:Soil;contamination, heavy;metals, ecological;risk, mining;plant
              
AuthorInstitution
Yin Bing-kui 东华大学环境科学与工程学院
Huang Man-hong 东华大学环境科学与工程学院
Li Guang-ming 中检集团理化检测有限公司
Zhang Da-lei 青岛理工大学环境与市政工程学院
Chen Liang 东华大学环境科学与工程学院
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Abstract:
      Heavy metals concentrations and their potential relationships in paddy soil around mining plants were analyzed by field sampling and laboratory testing. The results showed that the top soils were contaminated by Cd, Pb, Hg, Zn and Cu with a relatively higher Nemerow pollution index (>5). The pollution levels of heavy metals in soil are in the order: Cu>Hg>Zn>Cd>Pb>As>Cr. Statistical Analysis of the heavy metals data shown that Zn and Cd were in a significant positive correlation, while Hg and Zn/Cd were in positive correlation, which indicated the elevated Zn and Cd were from the same contamination sources (nearby historical mining activities). The average RI in the topsoil was about 2049.01, and Cd occupied about 90.34% and Hg was about 6.96%, which indicated that the paddy soil exhibited a higher potential ecological risk, especially from Cd and Hg.
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