Leaching experiments and risk assessment to explore the migration and risk of potentially toxic elements in soil from black shale

油页岩 浸出(土壤学) 渗滤液 环境科学 土壤水分 风化作用 环境化学 采矿工程 地质学 土壤科学 地球化学 化学 古生物学
作者
Fengyan Li,Tao Yu,Zhenzhong Huang,Tianyu Jiang,Lingxiao Wang,Qingye Hou,Qifeng Tang,Jiuchen Liu,Zhongfang Yang
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:844: 156922-156922 被引量:14
标识
DOI:10.1016/j.scitotenv.2022.156922
摘要

Black shale is rich in potentially toxic elements (PTEs) that migrate through rock weathering or rainfall, adversely affecting human health and the environment. In this study, simulated rainfall leaching experiments were used to investigate the migration patterns and leaching kinetics of PTEs in black shale from the Lower Cambrian Hetang Formation and to analyze the water quality index (WQI) of PTEs in the leachate. A comparison between the risk of PTEs in the leachate and those in the soil was also made to determine the risk sources, risk status, and distribution characteristics of PTEs in the study area. The WQI of the indoor column experimental leachate indicated the highest As contamination. The geo-accumulation index (Igeo) and potential ecological risk (Er) of soils in the entire region revealed that the risk of Cd was the highest. Furthermore, by mapping the distribution of Igeo and Er in soils, the risk level in the region where black shale is located was found to be significantly higher than that in other areas. Comparing the leaching rate of PTEs with the WQI from leaching experiments, the risk associated with As in soil can be inferred to originate mainly from the leaching of black shale. Previous studies on PTEs in black shale in the study area tended to focus on Cd; however, this study found that the risk of As was not negligible. The health risk assessment also showed that the risk at the location of black shale was beyond the accepted range. Overall, this study provided a new and important evaluation law for the level of pollution by PTEs and health risks in typical black shale regions.
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