Abstract
We investigated the concentration of heavy metals in the Fe–Mn nodules in soils derived from the carbonate rocks of typical karst areas in Guangxi, Southwest China. Compared with the soil background values in Guangxi, heavy metals are substantially enriched in the following order: Cd (268.13) > Pb (39.46) > Cr (11.80) > Zn (8.43) > Ni (6.16) > Cu (3.65). CaCl2 extraction results indicate that heavy metals in the nodules are substantially stable, while the proportions of the metals released to the surrounding environment are extremely low (≤ 0.003%). Moreover, pH-static leaching experiments indicate that heavy metals can hardly be dissolved into the surrounding soil environment under natural conditions (pH 6–8). However, once the soil environment is acidified, heavy metals incorporated in the nodules will gradually release into the surrounding environment, thereby causing potential ecological risks.
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Acknowledgements
This study was financially supported by the National Key R&D Program of China (Granted No. 2017YFD0800304), the ecological geochemical survey of heavy metals in typical soils of Guangxi and the research on the abnormal genesis and ecological effects of cadmium, selenium and germanium in soils of Guangxi.
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Ji, W., Yang, Z., Yu, T. et al. Potential Ecological Risk Assessment of Heavy Metals in the Fe–Mn Nodules in the Karst Area of Guangxi, Southwest China. Bull Environ Contam Toxicol 106, 51–56 (2021). https://doi.org/10.1007/s00128-020-02837-6
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DOI: https://doi.org/10.1007/s00128-020-02837-6