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Potentially toxic elements in smoke particles and residual ashes by biomass combustion from Huangshi National Mine Park, China

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Abstract

This paper investigates the fractional and spatial distribution characteristics of potentially toxic elements (PTEs) in smoke particles and residual ashes from mine-park-biomass combustion. It then evaluates the consequential potential environment risk by using a Geo-accumulation index and Nemerow pollution index methods. Biomass combustibles are comprised of Camphor leaves (CL), Camphor dead-branch (CB), Ramie (RA), Miscanthus sinensis (MS), and Dryopteris (DR). The results show that the products of combustion contain PTEs, As, Cr, Cu, and Zn, etc. Among them, the content of As, Cr, Cu, Pb elements in smoke particles of CB was higher than other combustibles. Moreover, Cr, Mn, Ni, and Pb in residual ashes of CL were higher than others. The proportion of acid-soluble and reducible fraction of As in residual ash was higher, while Cr existed mainly in the oxidizable and residual fraction. Besides, the available state of As gradually decreased from 74% (400 °C) to 41% (800 °C), indicating that the increase of temperature significantly reduced the bioavailability of As. Meanwhile, with the increase of temperature, the concentration of PTEs in smoke particles decreased and PTEs in residual ashes increased in different degrees. The risk evaluation results indicate that PTEs may cause moderate or higher levels of contamination. The overall contamination level of PTEs in the residual ashes of CB was higher than that of other plant. The results show in this study would contribute to understanding the environmental risks of wildfire and prescribed burning in PTEs-contaminated areas.

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Acknowledgements

The authors are grateful for the financial support of National Natural Science Foundation of China (51504174 and 51876148) and the technical support from the Analytical and Testing Center of Wuhan University of Technology.

Funding

This work was supported by National Natural Science Foundation of China (Grant numbers [51504174] and [51876148]).

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by [XY], [BZ], [ZT] and [CL]. The combustion experiments were instructed by [KL]. The manuscript was written and finalized by [YL] and all authors commented on the manuscript. All authors read and approved the final manuscript.

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Correspondence to Yanyan Liu.

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Liu, Y., Ye, X., Zhou, B. et al. Potentially toxic elements in smoke particles and residual ashes by biomass combustion from Huangshi National Mine Park, China. Environ Geochem Health 45, 629–645 (2023). https://doi.org/10.1007/s10653-022-01232-w

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  • DOI: https://doi.org/10.1007/s10653-022-01232-w

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