Distribution, source identification, and ecological-health risks of potentially toxic elements (PTEs) in soil of thallium mine area (southwestern Guizhou, China)
Distribution, source identification, and ecological-health risks of potentially toxic elements (PTEs) in soil of thallium mine area (southwestern Guizhou, China)
复制标题
DOI：
10.1007/s11356-019-04997-3
复制
发表时间：
2019-06-01
影响因子：
5.8
通讯作者：
Wang, Zhenghua
中科院分区：
文献类型：
--
作者：
Jiang, Feng;Ren, Bozhi;Wang, Zhenghua
由于铊的高毒性和易被人体吸收，通过采矿开采铊资源对生态系统和人类健康构成重大威胁。首次对黔西南州铊矿区潜在有毒元素的污染、空间分布、来源及生态健康风险进行了评价。利用ArcGIS可视化软件绘制了PTE的空间分布图，分析了PTE的分布趋势。利用富集因子（EF）、相关性分析和主成分分析等方法对7个矿区的PTEs进行了可能来源的识别。使用地质累积指数（I-geo）、潜在生态风险指数（RI）、人类非致癌风险（HI）和致癌风险（CR）对更广泛的风险评估进行了评价。结果表明，研究区的PTE含量确定了直接采矿，金属生产和生活污染源。此外，地形、雨水淋溶、河流冲刷等因素也影响了PTE的分布。主要元素是铊和砷，而镉，铬，铜，铅，锌没有显示出显着的富集，尽管与矿石存款在该地区。风险评估确定了严重的污染和生态风险，并对当地居民，特别是儿童的健康构成不可接受的风险。结果表明，该地区土壤中铊的生态风险最大，占74.32%，其次是砷（8.57%）和镉（7.32%）。PTE对研究区人体非致癌风险的贡献主要来自As和Tl，致癌风险以As为主，其他元素对人体健康无显著风险。
The exploitation of thallium (Tl) resources through mining poses a significant threat to ecological systems and human health due to its high toxicity and ready assimilation by human body. We report the first assessment of the pollution, spatial distribution, source, and ecological-health risks of potentially toxic elements (PTEs) in Tl mining area of southwest Guizhou, China. Spatial distribution maps for PTEs were visualized by ArcGIS to identify their distribution trends. We use the enrichment factor (EF), correlation analysis, and principal component analysis to identify likely sources of seven PTEs mining area. The wider risk assessment was evaluated using the geoaccumulation index (I-geo), potential ecological risk index (RI), human non-carcinogenic risk (HI), and carcinogenic risk (CR). The results revealed the PTEs content in the study area identifies direct mining, metal production, and domestic pollution sources. In addition, the distribution of PTEs was also affected by the topography, rain water leaching, and river dispersals. The main elements of concern are Tl and As, while Cd, Cr, Cu, Pb, and Zn do not show significant enrichment in the area despite associations with the ore deposit. Risk assessment identifies strong pollution and ecological risks and poses unacceptable human health risks to local residents, especially for children. The ecological risk in the study is identified to be predominantly from Tl (74.32%), followed by As (8.57%) and Cd (7.32%). The contribution of PTEs to the non-carcinogenic risk of humans in the study area is exclusively from As and Tl, while the carcinogenic risk is dominated by As, and the other elements pose no significant risk to human health.