期刊
HUMAN AND ECOLOGICAL RISK ASSESSMENT
卷 25, 期 1-2, 页码 32-51出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/10807039.2018.1531693
关键词
Groundwater quality; nitrate; heavy metal; health risk; Loess Plateau
资金
- National Natural Science Foundation of China [41502234, 41602238, 41572236, 41761144059]
- Research Funds for Young Stars in Science and Technology of Shaanxi Province [2016KJXX-29]
- Special Funds for Basic Scientific Research of Central Colleges [300102298301]
- Fok Ying Tong Education Foundation [161098]
- China Postdoctoral Science Foundation [2017T100719, 2016M590911]
- Shaanxi Postdoctoral Science Foundation [2016BSHTDZZ03]
- Ten Thousand Talents Program
Groundwater is the main source of water for domestic and agricultural purposes in Wuqi County on the Loess Plateau. The present study was carried out to assess the hydrochemical characteristics and quality of groundwater in the Luohe aquifer, which is a crucial aquifer for water supply. For this study, 22 groundwater samples and 6 surface water samples were collected for analysis. Hydrochemistry and hydrochemical facies of groundwater were analyzed using statistical analysis and Tri-linear diagram. Gibbs diagram, correlation analysis and bivariate plots were used to investigate the natural evolution mechanisms of groundwater and surface water. Potential health risks of nitrate and Cr6+ through drinking water ingestion for adults and children were estimated. The results show that the major hydrochemical facies is ClSO4-Na, mixed ClSO4HCO3-Na and SO4Cl-MgNa types, and high concentration of Na+ is a remarkable feature of groundwater in the study area. Groundwater chemistry evolution is affected by rock weathering and evaporation. The high concentrations of Na+, SO42- and TDS suggest that groundwater is not suitable for irrigation purposes. According to WQI values, above 80% of the groundwater samples are fair quality water. It is also found that the groundwater of the study area is contaminated with nitrate and Cr6+. Children are at higher health risk than adults. Multiple measures such as establishing new centralized water supply sources and inter-basin water transfer projects have also been proposed in this study to guarantee the safety of sustainable groundwater supply.
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