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Hydrochemical characterization and assessment of health risks of trace elements in the Huai River Basin of China

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Abstract

Basin water pollution is a global problem, especially in the densely populated areas. The Huai River Basin (abbreviated as HRB), including the Huai River system and the Yishu River system, is the sixth-largest and most densely populated watershed in China. However, there is a lack of comprehensive studies of river and well water throughout the Huai River basin, including hydrochemistry characterization and assessment of health risks. This study investigated water quality and pollution sources of river and well water in the HRB based on the hydrochemistry analysis and different water quality indices. The water body in the HRB showed weak alkalinity (pH = 8.4 ± 0.7) and had high TDS values (TDS = 339 ± 186 mg/L) with water types of HCO3-Ca-Mg and SO4-Cl-Ca-Mg in the Huai River system, and SO4-Cl-Ca-Mg in the Yishu River system. Atmospheric input and evaporation had less impact on hydrochemistry. Evaporite dissolution and carbonate weathering had a greater impact on hydrochemistry. Carbonate precipitation and cation exchange also influenced the dissolved solutes, especially Ca2+ and Na+. Samples had low to medium salinity hazards and sodium absorption ratios and were suitable for irrigation. For drinking purposes, samples were fresh water and have good or excellent according to the Water Quality Index (WQI). Land use types influenced water quality with the worst river water quality from cropland. Combining different assessment indices, the water quality of the Yishu River system performed better than the Huai River system. Absolute principal component analysis-multiple linear regression and the positive matrix factorization models identified the main pollutants as As, Ba, Cr, Ni, and Mn, with natural sources of As, Ba, and Ni and anthropogenic inputs of Cr, and Mn. Although the water quality of the HRB has improved in recent years, high potential risk from As, Cr, Mn, Ba, and Ni should be noted. This study provided vital information for basin hydrochemistry analysis and water quality assessment.

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Funding

This work was supported by Western Light-Key Laboratory Cooperative Research Cross-Team Project of Chinese Academy of Sciences (Grant numbers: xbzg-zdsys-202309), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant numbers: XDB40020502) and the Shaanxi Science Fund for Distinguished Young Scholars (Grant numbers: 2020JC-030).

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Contributions

Hao Tai: Data curation, Formal analysis, Methodology, Writing-original draft. Xiu Yi: Conceptualization, Data curation, Methodology, Project administration, Writing-review & editing. Ningpan Chai: Conceptualization, Data curation, Methodology, Writing-review & editing. Jun Xiao: Conceptualization, Funding acquisition, Methodology, Resources, Project administration, Supervision, Validation, Writing-original draft, Writing-review & editing.

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Correspondence to Jun Xiao.

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The authors declare no competing interests.

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Responsible Editor: Xianliang Yi

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Tai, H., Yi, X., Chai, N. et al. Hydrochemical characterization and assessment of health risks of trace elements in the Huai River Basin of China. Environ Sci Pollut Res 31, 28982–28996 (2024). https://doi.org/10.1007/s11356-024-33000-x

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  • DOI: https://doi.org/10.1007/s11356-024-33000-x

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