Lu Dingtian, Zhang Chaolan, Zhou Zirui, Huang Dan, Qin Chaoke, Nong Zexi, Ling Caiyuan, Zhu Yuqi, Chai Xingle
School of Resources, Environment and Materials, Guangxi University, Nanning, 530004, China.
China Nonferrous Metal Guilin Research Institute of Geology for Mineral Resources Co. Ltd., Guilin, 541004, China.
Environ Geochem Health. 2023 May;45(5):2533-2547. doi: 10.1007/s10653-022-01355-0. Epub 2022 Aug 29.
Long-term mining activities have caused serious heavy metals contamination of farmland soils. In this study, we investigated the concentrations, distributions, accumulations, potential ecological risk, and sources of eight heavy metals in farmland soils of Pb-Zn mining areas. According to the soil standard GB15618-2018, Cd was the most contaminated, followed by Pb and Zn. The geo-accumulation index showed that Pb, Zn, Cd, and Hg accumulated seriously. The potential risk index indicated that Cd, Hg, and Pb were the main environmental risk elements. An integrated approach combining multivariate statistical analysis, PMF, and GIS mapping was used to analyze the sources of heavy metals. Four main sources were identified and quantified: (1) mining activities source, the main source of Cd (71.09%) and Zn (61.88%); (2) agricultural activities source, dominated by Hg (73.01%); (3) atmospheric deposition sources, with Pb (85.11%) as the main contributor; (4) natural source, characterized by Cr (72.96%), Ni (66.04%), As (55.98%) and Cu (37.70%). This study would help us understand the pollution characteristics and sources of farmland soils in mining areas and provide basic information for the next step of pollution control and remediation.
长期的采矿活动已导致农田土壤受到严重的重金属污染。在本研究中，我们调查了铅锌矿区农田土壤中8种重金属的浓度、分布、积累情况、潜在生态风险及来源。根据土壤标准GB15618 - 2018，镉污染最为严重，其次是铅和锌。地累积指数表明铅、锌、镉和汞积累严重。潜在风险指数表明镉、汞和铅是主要的环境风险元素。采用多元统计分析、正定矩阵因子分解（PMF）和地理信息系统（GIS）制图相结合的综合方法来分析重金属的来源。确定并量化了四个主要来源：（1）采矿活动源，是镉（71.09%）和锌（61.88%）的主要来源；（2）农业活动源，以汞（73.01%）为主；（3）大气沉降源，主要贡献元素为铅（85.11%）；（4）自然源，特征元素为铬（72.96%）、镍（66.04%）、砷（55.98%）和铜（37.70%）。本研究将有助于我们了解矿区农田土壤的污染特征和来源，并为下一步的污染控制和修复提供基础信息。
