Qingdao Geo-Engineering Surveying Institute (Qingdao Geological Exploration and Development Bureau); Key Laboratory of Urban Geology and Underground Space Resources; Shandong Provincial Bureau of Geology and Mineral Resources, Qingdao Geology and Geotechnical Engineering Co., Ltd, Qingdao, 266100, China.
Key Lab of Marine Environmental Science and Ecology, Ministry of Education; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering; College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100, China.
Arch Environ Contam Toxicol. 2021 Jul;81(1):77-90. doi: 10.1007/s00244-021-00857-9. Epub 2021 May 31.
Heavy-metal pollution is a negative impact of municipal solid-waste landfills. The multiple pollution transport pathways (including leachate, runoff, and waste gas) and complex and co-existing potential pollution sources (such as agricultural activities) around landfills require a combination of different pollution assessment methods and source identification tools to address pollution distribution and potential risks. In this study, the distributions of eight heavy metals (chromium (Cr), copper (Cu), nickel (Ni), lead (Pb), zinc (Zn), arsenic (As), cadmium (Cd), and mercury (Hg)) around a landfill were analyzed using 60 topsoil samples. Ecological risk assessments indicated that there are currently no ecological risks. Based on health risk assessments, however, high concentrations of Cr and As in the soil pose a noncarcinogenic and carcinogenic risk to humans in the study area, respectively. In addition, the geoaccumulation indices for Cr, Cu, Ni, Zn, As, and Hg confirmed anthropogenic sources of accumulation of these metals in soils. Additionally, the potential ecological risk index indicated that Hg posed a considerable risk to the ecology of the area around the landfill. Sources of heavy metals in the study area were attributed to natural sources (22.10%), agricultural activities (27.65%), landfill (31.35%), and transportation (18.89%). The continuous accumulation of heavy metals and health risk for humans suggests the need to continuously monitor of heavy metal content and migration around the landfill. This study provides a reference for local authorities in the study area.
重金属污染是城市固体废物填埋场的一个负面影响。由于填埋场周围存在多种污染传输途径（包括渗滤液、径流和废气）和复杂且共存的潜在污染源（如农业活动），需要结合不同的污染评估方法和源识别工具来解决污染分布和潜在风险问题。在这项研究中，使用 60 个表层土壤样本分析了一个垃圾填埋场周围的八种重金属（铬（Cr）、铜（Cu）、镍（Ni）、铅（Pb）、锌（Zn）、砷（As）、镉（Cd）和汞（Hg））的分布情况。生态风险评估表明，目前不存在生态风险。然而，基于健康风险评估，土壤中 Cr 和 As 的高浓度分别对研究区域的人类构成非致癌和致癌风险。此外，Cr、Cu、Ni、Zn、As 和 Hg 的地积累指数证实了这些金属在土壤中的人为积累来源。此外，潜在生态风险指数表明，Hg 对填埋场周围地区的生态构成了相当大的风险。研究区域重金属的来源归因于自然源（22.10%）、农业活动（27.65%）、垃圾填埋场（31.35%）和交通运输（18.89%）。重金属的持续积累和对人类的健康风险表明需要持续监测填埋场周围的重金属含量和迁移情况。本研究为研究区域的地方当局提供了参考。
