Heavy metal pollution in a uranium mining and metallurgy area in South China
JING Chen-xin1,2,3, KONG Qiu-mei1, FENG Zhi-gang1
1. Hengyang Key Laboratory of Geological Theory and Technology for the Nuclear Fuel Cycle, School of Resources, Environment and Safety Engineering, University of South China, Hengyang 421001, China;
2. Laboratory of High Temperature and High Pressure of Internal Matter, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 55008, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China
Two background profiles (B1, B2) and three potentially polluted profiles (S1, S2, S3) around a uranium tailings pond in South China were selected. The characteristics and behaviors of exogenous heavy metal pollution in the soil of uranium tailings pond were discussed by comparing the distributions of heavy metal elements in each profile. Results showed that:(1) Compared with the background profile, the main and minor components in the soil adjacent to the uranium tailings reservoir were significantly input. (2) The tailings pond was the direct source of soil heavy metal pollution in the area, and the heavy metals such as As, Pb, Sb, Cd and U were transported to the peripheral soil, as shown in PCA. (3) The metal elements in potential polluted soil were closely related to LOI (loss on ignition), K and P, and have secondary correlation with Na, CA, Mn, pH and Fe. Heavy metals were significantly enriched in potential polluted profile (S1 and S2) according to the leaching and migration degree of heavy metals. From the tailings pond to its surrounding soil, the lateral migration characteristics of the heavy metals were different. (4) The potential risks of the tailings pond should be controlled because from tailings pond to its surrounding soil 30m, As, Pb, Sb, Cd and U were significantly polluted, and their contents exceed much larger than the agricultural land soil pollution risk control standards and the background value of the soil elements specified in the provincial level.
景称心, 孔秋梅, 冯志刚. 中国南方某铀尾矿库周缘土壤重金属污染研究[J]. 中国环境科学, 2020, 40(1): 338-349.
JING Chen-xin, KONG Qiu-mei, FENG Zhi-gang. Heavy metal pollution in a uranium mining and metallurgy area in South China. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(1): 338-349.
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