Characteristics and Environmental Risk Assessment of Heavy Metal Pollution in Cultivated Soil Around Abandoned Lead-Zinc Mining Areas
In order to explore the characteristics and environmental risks of heavy metal pollution in the cultivated land around the abandoned lead-zinc mine,taking an abandoned lead-zinc mine in the central Guizhou Plateau ar-ea as the research object,the cultivated land soil around the mining area was sampled and analyzed,and the char-acteristics of heavy metal pollution in the soil were evaluated.The results show that the average content of 7 heav-y metals in the surrounding soil exceeded the soil environment of Guizhou Province,and the excess order was Hg(33.80)＞Zn(20.95)＞Pb(7.29)＞As(1.78)＞Cd(0.36)＞Cu(0.21)＞Ni(0.12).The results of the correlation analy-sis showed that,Cu and Zn,Zn and Pb,As and Hg had good correlation,indicating that the sources of these heavy metals are similar;according to the Memero Composite Pollution Index,Zn,Pb,As,Hg have reached moderate and severe pollution levels,indicating that the cultivated land soil around the mining areas was polluted to differ-ent degrees;the evaluation results of the geological accumulation index method show that,Cr,Cd,Ni and Cu were clean;as was mildly contaminated;Pb was the partial and moderate contamination;Zn and Hg were heavy pollu-tion;the comprehensive potential ecological risk index of the study area was 1541.05,reaching a strong ecological hazard level,in which Hg contributed the most to the comprehensive potential ecological risk index.The results show that there are some potential ecological risks in the cultivated land soil around the mining areas.
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