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Ecological risk assessment of potentially toxic elements in selenium-rich soil with different land-use types

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Abstract

Dashan Village area is one of the representative areas in China with high selenium concentration in the natural environment. A total of 133 topsoil samples have been collected in the Dashan Village area to explore the potential toxic elements (PTEs) background concentrations in soils under different land-use types for a comprehensive PTEs risk assessment (arsenic, cadmium, chromium, copper, mercury, nickel, lead, selenium and zinc). The results show that the geometric mean concentrations of As, Cr, Cu, Hg, Ni, Pb, Se and Zn found in the soil of the Dashan Village area were lower than the control standard for soil contamination risk in agricultural land. However, the geometric mean concentrations of Cd exceeded their corresponding standard values. For different land-use types, geometric mean concentrations of As, Cd, Cu, Hg, Ni and Pb in the arable soils were higher than in woodland soils and tea garden soils. Based on the potential ecological risk assessment, the woodland, arable and tea garden were at low-risk levels. Cadmium posed the highest ecological risk, while the other PTEs were of low risk in soils. Multiple statistical analyses and geostatistical analysis indicated that the concentrations of Cr, Ni, Pb, Cu, Zn and Se originated mainly from natural sources, while the concentrations of Cd, As and Hg could be influenced by anthropogenic activities. These results provide scientific support for the safe utilization and ecological sustainability of selenium-rich land resources.

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Acknowledgements

This work was supported by Anhui Provincial Natural Science Foundation (Grant No. 1908085QD150).

Funding

This work was supported by Anhui Provincial Natural Science Foundation (Grant No. 1908085QD150). Author Bing Zhao has received research support from Science and Technology Department of Anhui Province, China.

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by JZ, WG, CX, YL, XS, BZ, XC, YX and SZ. The first draft of the manuscript was written by JZ, and all authors commented on previous versions of the manuscript.

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Correspondence to Shoubiao Zhou.

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Zhang, J., Ge, W., Xing, C. et al. Ecological risk assessment of potentially toxic elements in selenium-rich soil with different land-use types. Environ Geochem Health 45, 5323–5341 (2023). https://doi.org/10.1007/s10653-023-01574-z

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  • DOI: https://doi.org/10.1007/s10653-023-01574-z

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