Abstract
Selenium (Se) is an essential trace element for animals and plants. Se in soil has an important influence on the Se intake by animals and plants. To explore the source of Se in soils of the zinc-smelting area in northwest Guizhou, China, 271 topsoils and 50 deep soil samples were collected, and the concentration, speciation and distribution of Se in soils were analysed. The results showed that the concentration of Se in topsoils ranged from 0.2 mg/kg to 1.79 mg/kg, with an average of 0.84 mg/kg, which was more than 2 times of that in deep soil. These observations indicated that Se was enriched in the surface layer of soil. In terms of spatial distribution, high-Se topsoils (> 1.0 mg/kg) were mainly distributed near the zinc smelting area, and topsoil samples with relatively low content of Se were mainly distributed in areas with less human activities influence. The Se occurrence species in topsoils were in the order of residue, organic-binding, humic-acid binding, water-soluble, Fe/Mn/Al oxide-binding, carbonate-binding and ion-exchange. The contribution of residual Se to total Se in topsoil was decisive, and the content of other species of selenium changed slightly. The Se speciation that was residual in soil is difficult for plants to utilize, which is consistent with previous studies on seleniferous soils caused by zinc smelting. These results indicated that the main reason for Se enrichment in the topsoils of northwest Guizhou Province was indigenous zinc smelting.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China, Project of Karst Scientific Research Center of the People’s Government of Guizhou Province(U1612442), the science and technology projects of Guizhou Province (Qian Ke He [2020]1Y186; [2016]1078), the High Level Talent Training Program in Guizhou ([2016]5664) and the First Class Discipline Construction Project in Guizhou (GNYL[2017]007).
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Meng, W., Li, XX. & Wu, P. New Insights into Selenium Enrichment in the Soil of Northwestern Guizhou, Southwest China. Bull Environ Contam Toxicol 107, 1095–1102 (2021). https://doi.org/10.1007/s00128-021-03256-x
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DOI: https://doi.org/10.1007/s00128-021-03256-x