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Comparison of Pollution Characteristics and Magnetic Response of Heavy Metals in Dustfall before and after COVID-19 Outbreak in Shanghai

Authors :
Guan Wang
Qian Xin
Xueyu Geng
Xinyu Zhu
Wen Yao
Zhenxiang Ji
Feifan Ren
Source :
Applied Sciences, Vol 12, Iss 21, p 10853 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

In this study, dustfall samples were systematically collected in various regions of Shanghai before and after the occurrence of COVID-19 in December 2019 and December 2020. The magnetic response, content and pollution status of relevant heavy metal elements in the samples were analyzed using environmental magnetism, geochemistry, scanning electron microscopy (SEM) and the enrichment factor (EF) method. The results show that the magnetic particles in the dustfall samples are mainly pseudo-single-domain (PSD) and multi-domain (MD) ferrimagnetic minerals, and Fe, Zn, Cr, and Cu are mainly concentrated in the districts with intensive human activities. Due to restrictions on human activities following the COVID-19 epidemic, both the values of magnetic parameters and the heavy metal pollution level in 2019 are more significant than those in 2020, which is consistent with the Air Quality Index (AQI) results. In addition, magnetic susceptibility (χlf), non-hysteresis remanence (χARM) and saturation isothermal remanence (SIRM) have different degrees of correlation with heavy metal elements, and the correlations with Fe, Pb, Cr and Zn are extremely prominent. The magnetic parameters can effectively and quickly reflect the level of particulate matter pollution, making them a useful tool for monitoring urban air quality.

Details

Language :
English
ISSN :
20763417
Volume :
12
Issue :
21
Database :
Directory of Open Access Journals
Journal :
Applied Sciences
Publication Type :
Academic Journal
Accession number :
edsdoj.550de6f8bd6448478052d218988e7a1d
Document Type :
article
Full Text :
https://doi.org/10.3390/app122110853