Distribution characteristics and potential risk of heavy metals in soil around water source:A case study of Shenzhen city
ZHOU Rui1, QIN Chao1, REN Hen-jun1, ZHAO Yan2
1. National Joint Engineering Laboratory for Petrochemical Pollution Site Control and Restoration Technology, Jilin University, Changchun 130021, China; 2. Shenzhen Academy of Environmental Sciences, Shenzhen 518022, China
Abstract：Zn､Pb､As in three different types of soils (lato-red soil, red soil, and paddy soil) around the water sources in Shenzhen were selected as the research object. Their content and toxicity in the environment were high. And this study aims were exploring their distribution characteristics and existing species in the leaching layer, sedimentary layer and parent material layer (layers A, B and C) in these three soil profiles, analyzing the correlation between the content of heavy metals, the existing species and the physical and chemical properties of the soil. And based on them, we used the potential ecological hazard index and the potential migration index to evaluate the ecological risk of the heavy metals. The results showed:Zn, Pb, As had a higher content in each layer of the three types of soil, but they were all fewer than the background content of the local soil environmental quality, and the content of heavy metals was greatly affected by the local soil diagenetic parent material. The heavy metals were mainly in the residual state in the three types of soils. Relatively, the reducible Pb content in red soil was higher, and it was easy to transform into a weak acid soluable state at low pH, so it was easily release from soil and migrate to the water. Correlation analysis showed that the total amount of Zn and Pb was extremely significantly positively correlated with the organic matter content. The reducible state of Zn was significantly positively correlated with pH, and the weak acid soluable state of Pb and As was significantly positively correlated with the reducible state. The content of clay and powder particles affected the morphological distribution of lead and arsenic. The potential ecological hazards of the three heavy metals were all minor, which had little impact on the potential ecological risks of water source safety. The migration capacity of heavy metals in different soil types was red loam> latosolic red soil> paddy soil. The migration ability of the element in the soil was Zn>As>Pb; In latosolic red soil and paddy soil, the migration ability of Zn in layer A was the strongest, in layer B As was the strongest, and in layer C Zn, Pb, As were all weak. In red soil, Zn in layer A had the strongest migration ability, in layer B Zn, Pb, As were all strong, and Zn, Pb, As were all weak in layer C.
周睿, 秦超, 任何军, 赵妍. 水源地周边土壤重金属分布特征及潜在风险-以深圳市为例[J]. 中国环境科学, 2022, 42(6): 2734-2743.
ZHOU Rui, QIN Chao, REN Hen-jun, ZHAO Yan. Distribution characteristics and potential risk of heavy metals in soil around water source:A case study of Shenzhen city. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(6): 2734-2743.
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