{"title":"Effectiveness of magnetic separation pretreatment methods in evaluating heavy metal pollution in urban soils: a case study of Nanjing City.","authors":"Jian Zhang, Liang Liu, Xinran Wei, Yaoyao Sun, Liangjie Wang, Xiaoyue Xie","doi":"10.1007/s10653-025-02558-x","DOIUrl":null,"url":null,"abstract":"<p><p>Magnetic separation methods have been widely applied in the pretreatment of environmental samples. In this study, six types of soil samples from industrial areas, farmlands, residential areas, forest lands, green belts, and parks in Nanjing City underwent magnetic separation, forming strong and weak magnetic fractions. The magnetic susceptibility indicators (χ<sub>lf</sub>, χ<sub>fd</sub>%, and χ<sub>fd</sub>) and the contents of heavy metal elements (Cd, Cu, Pb, and Zn) were then determined. The magnetic susceptibility of the strong magnetic fraction (450.7 × 10<sup> -8</sup> m<sup>3</sup>·kg<sup> -1</sup>) was more than three times that of the original soil sample (141.1 × 10<sup> -8</sup> m<sup>3</sup>·kg<sup> -1</sup>). The magnetic substances within the strong magnetic fraction showed obvious enrichment in Cd, Cu, Pb, and Zn, with respective enrichment coefficients of 1.2, 2.2, 1.5, and 1.4, and their contents were higher than those in both the original soil sample and the weak magnetic fraction. Magnetic separation increased the contents of magnetic substances and heavy metals in the soil samples, which was more conducive to uncovering the relationship between magnetic indices and heavy metal contents. The correlation between the magnetic susceptibilities of the strong magnetic fraction and the original soil sample can indicate the degree of heavy metal pollution in urban soils, with a stronger correlation indicating more severe heavy metal pollution. Our findings demonstrate that the magnetic susceptibility of the strong magnetic fraction reflects heavy metal pollution and can thus play an important role in evaluating heavy metal pollution in urban soils.</p>","PeriodicalId":11759,"journal":{"name":"Environmental Geochemistry and Health","volume":"47 7","pages":"240"},"PeriodicalIF":3.2000,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Geochemistry and Health","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1007/s10653-025-02558-x","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}
引用次数: 0
Abstract
Magnetic separation methods have been widely applied in the pretreatment of environmental samples. In this study, six types of soil samples from industrial areas, farmlands, residential areas, forest lands, green belts, and parks in Nanjing City underwent magnetic separation, forming strong and weak magnetic fractions. The magnetic susceptibility indicators (χlf, χfd%, and χfd) and the contents of heavy metal elements (Cd, Cu, Pb, and Zn) were then determined. The magnetic susceptibility of the strong magnetic fraction (450.7 × 10 -8 m3·kg -1) was more than three times that of the original soil sample (141.1 × 10 -8 m3·kg -1). The magnetic substances within the strong magnetic fraction showed obvious enrichment in Cd, Cu, Pb, and Zn, with respective enrichment coefficients of 1.2, 2.2, 1.5, and 1.4, and their contents were higher than those in both the original soil sample and the weak magnetic fraction. Magnetic separation increased the contents of magnetic substances and heavy metals in the soil samples, which was more conducive to uncovering the relationship between magnetic indices and heavy metal contents. The correlation between the magnetic susceptibilities of the strong magnetic fraction and the original soil sample can indicate the degree of heavy metal pollution in urban soils, with a stronger correlation indicating more severe heavy metal pollution. Our findings demonstrate that the magnetic susceptibility of the strong magnetic fraction reflects heavy metal pollution and can thus play an important role in evaluating heavy metal pollution in urban soils.
期刊介绍：
Environmental Geochemistry and Health publishes original research papers and review papers across the broad field of environmental geochemistry. Environmental geochemistry and health establishes and explains links between the natural or disturbed chemical composition of the earth’s surface and the health of plants, animals and people.
Beneficial elements regulate or promote enzymatic and hormonal activity whereas other elements may be toxic. Bedrock geochemistry controls the composition of soil and hence that of water and vegetation. Environmental issues, such as pollution, arising from the extraction and use of mineral resources, are discussed. The effects of contaminants introduced into the earth’s geochemical systems are examined. Geochemical surveys of soil, water and plants show how major and trace elements are distributed geographically. Associated epidemiological studies reveal the possibility of causal links between the natural or disturbed geochemical environment and disease. Experimental research illuminates the nature or consequences of natural or disturbed geochemical processes.
The journal particularly welcomes novel research linking environmental geochemistry and health issues on such topics as: heavy metals (including mercury), persistent organic pollutants (POPs), and mixed chemicals emitted through human activities, such as uncontrolled recycling of electronic-waste; waste recycling; surface-atmospheric interaction processes (natural and anthropogenic emissions, vertical transport, deposition, and physical-chemical interaction) of gases and aerosols; phytoremediation/restoration of contaminated sites; food contamination and safety; environmental effects of medicines; effects and toxicity of mixed pollutants; speciation of heavy metals/metalloids; effects of mining; disturbed geochemistry from human behavior, natural or man-made hazards; particle and nanoparticle toxicology; risk and the vulnerability of populations, etc.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
