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Heavy metals speciation and distribution of microbial communities in sediments from the abandoned Mo-Ni polymetallic mines, southwest of China

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Abstract

Chemical fractions of heavy metals (Mo, Ni, Cu, Zn, Fe, Mn, Pb, Cd, and Cr) and compositions of bacteria and fungi in surface sediments from the Mo-Ni polymetallic mine area were analyzed. The results indicated that the mean concentrations of Mo, Ni, Cu, Zn, and Cd were higher than their background values. The mean percentage of Cr in residual fraction was much higher than that of other heavy metals. Mo, Cu, Zn, Fe, and Pb were mainly associated with oxidizable fraction. The dominant proportions of Mn and Cd were found in exchangeable fraction with mean percentages of 93.46% and 54.50%, respectively. According to RAC classification and potential ecological risk index (PERI), the Cd with high bioavailability had a very high environmental risk. The MisSeq sequencing results of bacteria and fungi revealed that microbial communities discrepantly respond to different sampling sites. The most abundant phylum of bacteria and fungi were Proteobacteria and Ascomycota, respectively. The bioavailable heavy metals including Mo-B, Pb-B, and Cd-B were recognized to have important influences on both dominant bacterial and fungal communities. The present study manifested that the bioavailability of heavy metal is very important to assess the potential environmental risk and plays a key role in shaping microbial structure.

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The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This study was supported by the National Natural Science Fund (U1612441), the Education Department of Guizhou Province (no. QJHKYZ [2019]110, [2019]116), Joint Research Program of Zunyi Science and Technology Bureau, and Zunyi Normal University (no. ZSKHJ [2018]04).

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SC organized this study, conducted the study design, and drafted the manuscript. SZ contributed to the study design. JC contributed to the prepared samples. QW and YD contributed to sample tests and data analysis.

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Correspondence to Shenwen Cai.

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The authors declare no competing interests.

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Communicated by Robert Duran.

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Cai, S., Zhou, S., Cheng, J. et al. Heavy metals speciation and distribution of microbial communities in sediments from the abandoned Mo-Ni polymetallic mines, southwest of China. Environ Sci Pollut Res 29, 35350–35364 (2022). https://doi.org/10.1007/s11356-022-18697-y

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  • DOI: https://doi.org/10.1007/s11356-022-18697-y

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