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Identifying the geochemical evolution and controlling factors of the shallow groundwater in a high fluoride area, Feng County, China

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Abstract

Understanding how groundwater is formed and evolves is critical for water resource exploitation and utilization. In this study, hydrochemistry and stable isotope tracing techniques were adopted to determine the key factors influencing groundwater chemical evolution in Feng County. A total of fourteen wells and five surface water samples were investigated in November 2021. The δD and δ18O compositions show that both surface water and groundwater are recharged from atmospheric precipitation. The dominating order of cations and anions in groundwater appears to be Na+ > Mg2+ > Ca2+ > K+ and HCO3 > SO42− > Cl > NO3 > F, respectively. The groundwater hydrochemical facies are mainly characterized by HCO3-Ca-Mg and SO4-Cl-Na types. The chemical evolution of groundwater is dominated by water–rock interaction and cation exchange reactions. The major ions in groundwater are mainly controlled by various geogenic processes including halite, gypsum, calcite, dolomite, Glauber’s salt, feldspar, and fluorite dissolution/precipitation. Furthermore, the abundant fluoride-bearing sediments, together with low Ca2+, promote the formation of high F groundwater. Approximately 85.7% and 28.6% of groundwater samples exceeded the permissible limit for F and NO3 respectively. Apart from geogenic F, human interventions (i.e., industrial fluoride-containing wastewater discharge and agricultural phosphate fertilizer uses) also regulate the F enrichment in the shallow groundwater. Nitrate pollution of the groundwater may be attributed to domestic waste and animal feces. Our findings could provide valuable information for the sustainable exploitation of groundwater in the study area and the development of effective management strategies by the authorities.

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Data availability

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors thank our colleagues and graduate students for their help in data collection and fieldwork. Special thanks to the editor and anonymous reviewers for their critical comments and valuable suggestions in the present form.

Funding

This study was supported by the National Key Research and Development Program of China (2020YFD0900703) and the Science and Technology Project on Water Conservancy in Jiangsu Province (2021056).

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Contributions

Shou Wang contributed to the investigation, data analysis, interpretation of results, and original draft. Jing Chen was involved in funding acquisition, project management, conceptualization, and writing review. Wei Jiang contributed to data curation and editing. Shuxuan Zhang was involved in the investigation, sample analysis, interpretation of results, and writing. Ran Jing contributed to the investigation, and data analysis. Shengyun Yang was involved in the literature collection and formal analysis. All authors read and approved the final draft.

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Correspondence to Jing Chen.

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The authors declare no competing interests.

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Responsible Editor: Xianliang Yi

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Highlights

• Rock weathering principally predominated the groundwater chemistry.

• Groundwater is undersaturated for the evaporitic minerals, whereas carbonate is saturated.

• Fluorinated minerals and phosphate fertilization use controlled the F in groundwater.

• Nitrate contamination is derived from domestic sewage, animal feces, and industrial wastewater.

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Wang, S., Chen, J., Jiang, W. et al. Identifying the geochemical evolution and controlling factors of the shallow groundwater in a high fluoride area, Feng County, China. Environ Sci Pollut Res 30, 20277–20296 (2023). https://doi.org/10.1007/s11356-022-23516-5

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  • DOI: https://doi.org/10.1007/s11356-022-23516-5

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