Assessment of heavy metals should be performed before the development of the selenium-rich soil: A case study in China

表土 土壤水分 环境化学 重金属 环境科学 污染 富集因子 污染 采矿工程 化学 冶金 土壤科学 地质学 材料科学 生物 生态学
作者
Yonglin Liu,Shuling Liu,Wei Zhao,Chuanbo Xia,Mei Wu,Qing Wang,Zhiming Wang,Yun Jiang,Andrew V. Zuza,Xinglei Tian
出处
期刊:Environmental Research [Elsevier BV]
卷期号:210: 112990-112990 被引量:21
标识
DOI:10.1016/j.envres.2022.112990
摘要

The use of selenium (Se)-rich soils in China is an effective method for rural revitalization, but assessment of heavy metals is essential prior to the development of Se-rich soils. This study was focused on the Jiangjin district, a typical Se-rich area located in Sichuan Basin of China, to investigate contamination, influencing factors, and sources of As, Cr, Cu, Cd, Ni, Pb, Sb, and Zn based on 156 topsoil samples. This study analyzed and compared the enrichment factor (EF), Nemerow index (PN), geographical information system (GIS), and positive matrix factorization (PMF). Results demonstrate that the average values of As, Cu, Cd, Sb, and Zn in topsoil were higher than the soil background values of western Chongqing by approximately 1.75, 1.11, 1.27, 1.71, and 2.58 times, respectively, indicating that some heavy metals have been enriched in the soils. The polluted areas of As, Cu, Cd, and Zn in topsoil were mainly distributed in the northern and central Jiangjin district, whereas high-Sb soils were located in the southeast. The Cr, Cu, Cd, Pb, and Sb were concentrated in Se-rich soils, indicating that heavy metals pollution should be carefully considered for the utilization of Se-rich soils. Four potential sources of heavy metals were found in this study area: 1) the parent materials (Cr, Ni, Cu); 2) industrial activities with high coal consumption (As); 3) mechanical and chemical industrial activities (Zn, Sb); and 4) transportation and agricultural activities (Pb, Cd). These observations provide a scientific basis for the development, utilization, and protection of Se-rich soil resources.
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