Accessible Phreatic Groundwater Resources in the Central Shijiazhuang of North China Plain: Perspective From the Hydrogeochemical Constraints

作者：Yong Xiao, Dian Xiao, Qichen Hao, Kui Liu, Rui Wang, Xun Huang, Xin Liao, Yunhui Zhang · 发表于：Frontiers in Environmental Science · 年份：2021 · DOI：10.3389/fenvs.2021.747097 · 被引用次数：26 · 研究领域：Groundwater and Isotope Geochemistry、Water Quality and Pollution Assessment、Groundwater and Watershed Analysis

Phreatic groundwater plays a significant role in the water supply for human communities, especially in water scarce regions. This research was conducted to investigate the hydrochemistry and contamination of phreatic groundwater and their constraints on drinking water supply in a semiarid region of the North China Plain. A total of 49 phreatic groundwaters were collected for the hydrochemical analysis. The results suggested the phreatic groundwater had a slightly alkaline nature. Although the groundwater had a large variation of salinity with the TDS of 172–1,875 mg/l, most groundwater was moderately-hard fresh and of HCO 3 -Ca type. Contaminants of NO 3 − , NO 2 − , NH 4 + , Fe, F − , Zn, Mn were detected, but only NO 3 − , NO 2 − , NH 4 + , and Fe were found exceeding the drinking water desirable limits at some sites. The nitrogen contaminants were from anthropogenic inputs (urban sewage effluents and agricultural fertilizers) and mainly distributed in the central study area. The anthropogenic inputs of nitrogen contaminants also elevated groundwater salinity. Among the exceeding contaminants, only NO 3 − would pose a potential health risk to water consumers. The existing health risks by NO 3 − ranged from medium risk (HQ of 1–4) to high risk (hazard quotient > 4) for all populations, and most risks were categorized into the medium risk rank. Groundwater F − was also found with health risk at some sporadic sites although it did not exceed, only approached, the desira...