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Formation processes of groundwater in a non-ferrous metal mining city of China: Insights from hydrochemical and strontium isotope analyses

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Abstract

Tongling is a significant non-ferrous metal mining city in China, which produces waste that negatively impacts the area’s water environment. It is essential to comprehend the hydrochemical properties and formation processes of groundwater to safeguard and utilize it efficiently. We explored major ions, strontium, and its isotopes in water and river-bottom samples from the northern (i.e., A-A’ section) and southern (i.e., B-B’ section) areas. The hydrochemical facies show the mining activities have a greater impact on surface water than on groundwater. Groundwater hydrochemical formation results from several factors, with water–rock interaction and ion exchange being primary. Additionally, the dissolution of calcite, dolomite, and feldspar, oxidation of pyrite, and hydrolysis of carbonate minerals also impact the formation of groundwater chemistry. Our analysis of strontium and its isotopes indicates that carbonate dissolution primarily occurred in the recharge area; the runoff from the recharge to the discharge area results in the dissolution of certain silicate rocks; calcite dissolution sources account for > 70% contribution in both surface water and groundwater water–rock interactions, whereas silicate rock dissolution sources and dolomite dissolution sources account for < 30%. Due to changed order of dissolved carbonate and silicate minerals during groundwater flow, the distribution of strontium and its isotopes in the A-A’ section is opposite to that in the B-B’ section. The findings provide a basis for developing, utilizing, managing, and protecting groundwater resources, especially in similar mining areas.

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Funding

This research was financially supported by the National Key R&D Program of China (2021YFC2902004), the Inner Mongolia Science and Technology Major Project (Grant 2020ZD0020), the National Natural Science Foundation of China (Grant 41972259 and 42072284), the Natural Science Foundation of Hebei Province (Grant E2020402087), and the Open Project Program of the Shandong Provincial Lunan Geo-engineering Exploration Institute (Grant LNY2020-Z01).

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Aoshuang Mei: methodology, data curation, writing—original draft preparation, writing—review and editing, and investigation. Xiong, Wu: conceptualization, supervision, and writing—review and editing. Yifan Zeng: conceptualization and supervision. Ge Zhu: investigation and visualization. Di Zhao and Yuzhe Zhang: visualization, investigation, and data curation.

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Correspondence to Xiong Wu.

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Responsible Editor: Xianliang Yi

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Mei, A., Wu, X., Zeng, Y. et al. Formation processes of groundwater in a non-ferrous metal mining city of China: Insights from hydrochemical and strontium isotope analyses. Environ Sci Pollut Res 31, 15716–15732 (2024). https://doi.org/10.1007/s11356-024-32186-4

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  • DOI: https://doi.org/10.1007/s11356-024-32186-4

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