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Heavy metals in road dust across China: occurrence, sources and health risk assessment

Abstract

We investigated the occurrence of Cd, Cr, Cu, Ni, Pb and Zn in 28 road dust samples collected across China from June to August, 2020. The mean concentrations of Cd, Cr, Cu, Ni, Pb and Zn were 3.16, 24.2, 27.4, 10.4, 49.8 and 608 mg·kg− 1, respectively. The mean levels of Cd and Zn exceeded the Chinese background values by 32.6- and 8.2- fold. Cd, Ni mainly distributed in southern China, whereas Cu, Pb and Zn mainly distributed in central China. Higher concentrations of Cd, Cr, Cu and Pb were found in road dusts from urban areas than those from rural areas. Cu and Ni mainly came from natural sources; Pb and Cd mainly originated from industrial emissions and vehicle exhaust. Hand-mouth ingestion was the most common exposure pathway for both adults and children, followed by dermal contact and inhalation. Pb was found to be the highest risk element via ingestion. No significant non-carcinogenic risks and carcinogenic risks were found for local residents.

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Acknowledgements

This study was supported by the Science and Technology Development Program of Jilin Province (20200403020SF); the Natural Science Foundation of Changchun Normal University (2019009).

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Correspondence to Baolin Liu.

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The authors declare that they have no conflict of interest related to this study.

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Huang, F., Liu, B., Yu, Y. et al. Heavy metals in road dust across China: occurrence, sources and health risk assessment. Bull Environ Contam Toxicol 109, 323–331 (2022). https://doi.org/10.1007/s00128-022-03558-8

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  • DOI: https://doi.org/10.1007/s00128-022-03558-8

Keywords

  • Heavy metals
  • Road dust
  • Source
  • Health risk assessment