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Bioaccessibility of lead and cadmium in soils around typical lead-acid power plants and their effect on gut microorganisms

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Abstract

Potentially toxic elements (Pb and Cd) contamination of soil can adversely affect human health. Moreover, these metal ions interact with the gut microbiota after entering the human digestive system. Based on the physiologically based extraction test and the simulator of human intestinal microbial ecosystem, the bioaccessibility of Pb and Cd in soils contaminated with lead-acid power plants was assessed. The gastric stage exhibited the greatest average bioaccessibility of lead and cadmium (63.39% and 57.22%), followed by the small intestinal stage (6.86% and 36.29%); due to gut microorganisms, the bioaccessibility of lead and cadmium was further reduced in the colon stage (1.86% and 4.22%). Furthermore, to investigate soil contamination’s effects on gut microbes, 16S rRNA high-throughput sequencing was used to identify the gut microbial species after the colon period. Due to Pb and Cd exposure, the relative abundance of Firmicutes and unidentified_Bacteria decreased, while the relative abundance of Proteobacteria, Synergistota, and Bacteroidota increased. The relationship between environmental factors and the number of microbial species in the gut was also examined using Spearman correlation analysis. Pb and Cd exposure has been found to affect the composition and structure of the gut microbiota.

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Funding

This study was financially supported by the National Natural Science Foundation of China (41671485), Research Leader Studio Project for Jinan University (2021GXRC093) and Open Fund of Shandong Engineering Research Center for Environmental Protection and Remediation on Groundwater (801KF-2021-5, 801KF-2022-13).

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SXZ and ZWD involved in methodology, investigation, formal analysis, and writing—original draft; HKF, GMS, YYL, XYJ, and XW involved in investigation and data curation; XYY and LHW involved in conceptualization, funding acquisition, resources, supervision, and writing—review and editing.

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Correspondence to Xixiang Yin or Lihong Wang.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Zhang, S., Deng, Z., Yin, X. et al. Bioaccessibility of lead and cadmium in soils around typical lead-acid power plants and their effect on gut microorganisms. Environ Geochem Health 46, 107 (2024). https://doi.org/10.1007/s10653-023-01840-0

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  • DOI: https://doi.org/10.1007/s10653-023-01840-0

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