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Hydrochemical and stable isotope (δ2H and δ18O) characteristics and hydrogeochemical processes in the Baotu Spring Basin, Eastern China

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Abstract

The safety of groundwater quantity and quality is essential for economic development and the ecological environment in the Baotu Spring Basin (BTSB). Thus, it is important to correctly recognize groundwater recharge, the source of major ions, seasonal differences, and the mechanisms of groundwater hydrogeochemical processes. To investigate these issues, surface and groundwater samples were collected and analyzed for hydrochemical components in both the dry and wet seasons in the BTSB. Stable isotope samples of the surface water and groundwater were collected and analyzed in the dry season. The hydrochemical results show that Ca and HCO3 are the dominant cations and anions, and HCO3·SO4-Ca is the dominant groundwater type in the dry and wet seasons. The stable isotope results indicate that precipitation is the primary recharge source of groundwater and surface water in the study area, and precipitation may undergo secondary evaporation under clouds that are in the process of dropping. Moreover, surface water recharges groundwater in infiltration areas near rivers or lakes, where mixing action occurs. The dissolution of calcite, dolomite, and gypsum is the primary water-rock interaction in hydrochemical evolutionary processes. Furthermore, anthropogenic inputs, such as NO3 and Cl, become more important factors affecting the chemical compositions of the surface water and groundwater. Moreover, three ion types (K, Na, and Cl/Ca; Mg and HCO3/NO3; and SO4) were classified in the study area according to the distribution of the ion ratios in the dry and wet seasons. This work provides hydrochemical evidence for water resource management and ecological restoration in the BTSB.

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Acknowledgements

We thank the reviewers and Editor for their useful comments, which helped improve the manuscript.

Funding

This work was financially supported by the National Natural Science Foundation of China (No. 41772257; 41472216) and Shandong Provincial Bureau of Geology & Mineral Resources (No. KY2018003; KY201933).

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All authors contributed to the study conception, implementation, and analysis. Material preparation and sampling were performed by Shuai Gao, Hailin Zhang, Minghui Lv, Bin Sun, Hanliang Zhang, Shiting Gang, and Fanqi Meng. Most analyses were performed by Shuai Gao, Changsuo Li, and Chao Jia. The first draft of the manuscript was written by Shuai Gao and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Chao Jia.

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The authors declare that they have no competing interests.

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Responsible Editor: Broder J. Merkel

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Gao, S., Li, C., Jia, C. et al. Hydrochemical and stable isotope (δ2H and δ18O) characteristics and hydrogeochemical processes in the Baotu Spring Basin, Eastern China. Arab J Geosci 14, 2084 (2021). https://doi.org/10.1007/s12517-021-08410-7

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  • DOI: https://doi.org/10.1007/s12517-021-08410-7

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