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Hydrogeochemical characteristics and gradual changes of groundwater in the Baiquan karst spring region, northern China

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Abstract

Karst groundwater in the Baiquan spring region is necessary for domestic use, agricultural irrigation, and industrial production in Xingtai City, northern China. Understanding the hydrogeochemistry of important groundwater resources and how they respond to sustained mining and agricultural activities is essential. Samples of karst groundwater and Quaternary sediment groundwater were collected and their hydrogeochemical properties were evaluated, environmental isotopes were determined, and statistical analyses were performed to reveal the geochemical processes controlling groundwater quality. The results indicate that the karst groundwater tested in this study area has a meteoric origin, the dissolution processes of dolomite and gypsum are dominant in water–rock interactions, and evaporation occurs in discharge areas where the groundwater is shallow-buried and slow-flowing. The preferential flows of karst groundwater in the northern region are characterized by the chemical compositions of HCO3–Ca·Mg type, while concentrated mining activities in the southern region increase the concentration of SO42− in karst groundwater, and SO4·HCO3–Ca, HCO3·SO4–Ca, SO4·HCO3–Ca·Mg, and SO4–Ca hydrochemical types of groundwater are formed. Compared to karst groundwater, the variability of the TDS and main ion concentrations in shallow Quaternary sediment groundwater is evident, and the hydrochemical types are also more diverse. In addition to mining activities, sewage from agricultural production and domestic sources have also negatively impacted the quality of groundwater in both exposed and buried carbonate areas, as evidenced by the increasing NO3 and Cl contents in karst groundwater and Quaternary sediment groundwater. These results help explain the mechanisms of gradual hydrogeochemical changes and may assist the development of effective solutions to prevent groundwater pollution.

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Acknowledgements

This study was financially supported by Geological Survey Project of Chinese Academy of Geological Sciences (DD20160238), the S&T Program of Hebei (D2019403193, D2019403194), the Special Fund for Basic Scientific Research of Chinese Academy of Geological Sciences (JYYWF20181301), the Youth Science and Technology Foundation of Hebei GEO University (QN202111), and the Scientific Research Starting Foundation of Hebei GEO University (BQ201610).

Funding

This study was supported by Geological Survey Project of Chinese Academy of Geological Sciences (DD20160238), the S&T Program of Hebei (D2019403193, D2019403194), the Special Fund for Basic Scientific Research of Chinese Academy of Geological Sciences (JYYWF20181301), the Youth Science and Technology Foundation of Hebei GEO University (QN202111), and the Scientific Research Starting Foundation of Hebei GEO University (BQ201610).

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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by XL, RW and AW. The first draft of the manuscript was written by RW and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Xiaohan Li.

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Wang, R., Li, X. & Wei, A. Hydrogeochemical characteristics and gradual changes of groundwater in the Baiquan karst spring region, northern China. Carbonates Evaporites 37, 47 (2022). https://doi.org/10.1007/s13146-022-00794-1

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