the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
High Enrichment of Heavy Metals in Fine Particulate Matter through Dust Aerosol Generation
Qianqian Gao
Shengqiang Zhu
Kaili Zhou
Jinghao Zhai
Shaodong Chen
Qihuang Wang
Shurong Wang
Jin Han
Xiaohui Lu
Hong Chen
Liwu Zhang
Zimeng Wang
Qi Ying
Xiaofei Wang
Abstract. Dust is a major source of atmospheric aerosols. Its chemical composition is often assumed to be similar to the parent soil. However, this assumption has not been rigorously verified. Here, we generated dust aerosols from soils to determine if there is particle size-dependent selectivity of heavy metals in the dust generation. Mn, Cd, Pb and other heavy metals were found to be highly enriched in fine (PM2.5) dust aerosols, which can be up to ~6.5-fold. To calculate the contributions of dust to atmospheric heavy metals, regional air quality models usually use the dust chemical profiles from the US EPA’s SPECIATE database, which does not capture the correct size-dependent selectivity of heavy metals in dust aerosols. Our air quality modeling for China demonstrates that the calculated contribution of fine dust aerosols to atmospheric heavy metals, as well as their cancer risks, could have significant errors without using proper dust profiles.
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Qianqian Gao et al.
Status: open (until 12 Apr 2023)
Qianqian Gao et al.
Qianqian Gao et al.
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