Characteristics and risk elimination of heavy metal pollution in long-term suspension mine soil under natural restoration
The pollution characteristics of abandoned small and medium-sized iron ore without ecological restoration were analyzed based on the determination of heavy metal content.The local accumulation index was used to analyze its diffusion characteristics.The main accumulation index of As,Cd,Cu,Ni and other heavy metals was positive.Under the condition of natural restoration,pollutants would gradually accumulate with the extension of waste time,and the environmental pollution risk would gradually increase,and the cumulative efficiency was Ni>Cu>Cd>As.The cumulative index of Cr,Pb,Zn and Mo was negative,and the pollution degree of soil decreased with the extension of time.From the results of migration,heavy metals such As as,Cd,Cu and Ni showed a significant decrease trend with the increase of distance,while the content of Mo,Pb and Cr did not decrease significantly with the increase of distance.From the performance of different heavy metal elements,the results of different pollution disturbances were also different,the disturbance index of As was the highest,reaching 23.12,for heavy pollution,Cd was followed by the disturbance index,reaching 8.81,for light pollution,Cu and Ni were slight pollution,and other heavy metal elements were pollution-free.The content of Pb and Zn in the long-discontinued mining area was high,and presents a normal distribution trend,in which the skewness deviation of As and Zn is close to 1,the skewness of Cr,Pb and Mo was negative,and the skewness of Cd and Cu was positive and high.Based on the characteristics of pollutants,the risk was effectively eliminated by means of multiple methods in the pollution source,pollution path and pollution end direction.
万方数据
维普
