Department of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China.
Environ Sci Pollut Res Int. 2019 Mar;26(9):8958-8970. doi: 10.1007/s11356-019-04338-4. Epub 2019 Feb 4.
In this study, for exploring the relationship between selected magnetic properties and heavy metal contamination of street dust in Shanghai, China, 160 samples from five different functional areas (industrial, high traffic density, commercial, residential and "clean" area) were collected and investigated by magnetic and geochemical analyses. It is found that the street dust exhibits a high concentration of ferrimagnetic minerals, which are predominantly coarse-grained. Meantime, the magnetic properties of the street dust samples exhibit significant differences between the five functional areas, namely, the values of χ, SIRM, χ, and S in the five functional areas all decrease in the following order: industrial > commercial > high traffic density > residential > clean. Calculation of enrichment factors (EF) and the Tomlinson pollution load index (PLI) indicates that the street dust samples are highly polluted in terms of their degree of heavy metal contamination. The values of χ, SIRM, and χ are significantly correlated with Pb, Cu, Zn, Ni, Mn, Cr, Ba, and Fe concentrations as well as PLI. In accordance with similar findings in other urban areas, these results indicate that magnetic parameters, such as χ, SIRM, χ, can be used as an efficient proxy for heavy metal pollution and anthropogenic activities in Shanghai. In addition, the results demonstrate that it is possible to distinguish different heavy metal pollution sources using a combination of magnetic measurements and geochemical analysis.
本研究旨在探讨中国上海街道尘中选定磁性特征与重金属污染之间的关系，为此采集并分析了来自五个不同功能区（工业区、交通高密度区、商业区、居民区和“清洁”区）的 160 个样本。结果表明，街道尘中含有高浓度的亚铁磁性矿物，且主要为粗粒级。同时，五个功能区的街道尘样品磁性特征存在显著差异，其 χ、SIRM、χf 和 S 值按以下顺序递减：工业区＞商业区＞交通高密度区＞居民区＞清洁区。富集因子（EF）和汤姆林森污染负荷指数（PLI）的计算表明，街道尘样品重金属污染程度很高。χ、SIRM 和 χf 值与 Pb、Cu、Zn、Ni、Mn、Cr、Ba 和 Fe 浓度以及 PLI 显著相关。与其他城市地区的类似发现一致，这些结果表明，χ、SIRM、χf 等磁性参数可作为上海重金属污染和人为活动的有效示踪物。此外，结果表明，结合磁测量和地球化学分析，有可能区分不同的重金属污染源。
