Stable Iron Isotopic Signature Reveals Multiple Sources of Magnetic Particulate Matter in the 2021 Beijing Sandstorms
2022
Zuo, Peijie | Huang, Yuming | Liu, Pengfei | Zhang, Jingwei | Yang, Hang | Liu, Lin | Bi, Jianzhou | Lu, Dawei | Zhang, Qinghua | Liu, Qian | Jiang, Guibin
Airborne magnetic particulate matters (MPs) in PM₂.₅ have been observed in human tissues, for example, the brain, heart, and pleural effusion, which have attracted widespread concern. Here, we show that the pollution level of MPs in PM₂.₅ (MPsPM₂.₅) increased remarkably during the 2021 Beijing sandstorm episodes. Moreover, the stable Fe isotopic compositions of MPsPM₂.₅ were investigated to identify and constrain the origins of the increased MPsPM₂.₅ pollution. We presented that the fine MPs pollution in PM₂.₅ during the Beijing sandstorm episodes in 2021 was emitted from a mixture of natural dust and anthropogenic emissions, rather than only a natural origin. More importantly, anthropogenic emissions played a more important role in MPsPM₂.₅ during most of the 2021 Beijing sandstorm episodes. Our results were essential for further evaluation of the health risks and climatic impacts of PM₂.₅, particularly for MPsPM₂.₅, during the sandstorm episodes. Furthermore, this study indicated that the sources and characteristics of PM₂.₅ during the 2021 Beijing sandstorms were more complex than previously expected (PM₂.₅ during the sandstorms was dominated by lithogenic material from arid regions), and hence, high-precision characterizations of their sources, chemical compositions, and toxicologies are needed for future pollution control.
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