Assessment of heavy metal pollution and potential ecological risks of soils in Zhenxiong County,Yunnan Province
Ya-Long ZHOU1,2, Zhi-Juan GUO1,2, Cheng-Wen WANG1,2, Jie CHEN3, Min PENG1,2, Hang-Xin CHENG1,2
1. Institute of Geophysical and Geochemical Exploration, CAGS, Langfang 065000, China 2. Key Laboratory of Geochemical Cycling of Carbon and Mercury in the Earth's Critical Zone,CAGS, Langfang 065000, China 3. Yunnan Institute of Geological Survey,Kunming 650216, China
Based on the current evaluation standards of soil environmental quality and food safety, the authors used the single factor index method, Nemero composite index method and Hakanson potential ecological hazard index method to carry out soil heavy metal pollution and potential ecological risk assessment so as to find out the environmental risk level and spatial distribution characteristics of soil heavy metal pollution in the study area. The results of Nemero composite index evaluation indicate that high pollution occurs in the study area, and the proportion of slight pollution , moderate pollution and high pollution is respectively 39.03%, 16.62% and 28.57%. However, the potential ecological risk of Cu, Hg, As, Ni, Pb, Cr, Zn is low in soil in eight heavy metals, while the level of risk of Cd is higher, and the proportion of the samples with low, medium, slight, high, seriously potential risk is 17.71%, 17.71%, 22.77%, 12.31% and 8.00%, with the average of potential ecological harm index ( )being 118.24. The sites of high and higher potential ecological hazard of Cd in the soil are mainly located in the Lower Permian stratigraphic unit. Meanwhile, the heavy metal evaluation of 45 corn seeds shows that only one corn seed has excessive Cd content, and there is no obvious correlation between the content of Cd in corn seeds and the corresponding crop root soil. The high content of Cd seems mainly affected by geological background, but has no influence on corn seeds in the study area,and the risk of the absorption and enrichment of Cd by crops is higher with the increase of the soluble Cd content in a highly acidic soil environment.
周亚龙, 郭志娟, 王成文, 陈杰, 彭敏, 成杭新. 云南省镇雄县土壤重金属污染及潜在生态风险评估[J]. 物探与化探, 2019, 43(6): 1358-1366.
Ya-Long ZHOU, Zhi-Juan GUO, Cheng-Wen WANG, Jie CHEN, Min PENG, Hang-Xin CHENG. Assessment of heavy metal pollution and potential ecological risks of soils in Zhenxiong County,Yunnan Province. Geophysical and Geochemical Exploration, 2019, 43(6): 1358-1366.
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