Search

In order to grasp the groundwater chemistry characteristics and water quality in the Dingbian area, the collected 93 groundwater samples were used to assess the groundwater quality, water chemistry characteristics and human health risks caused by nitrate pollution by using WQI water quality index method, human health risk evaluation model, ion ratio method, Piper trilinear diagram and Gibbs model. The results show that the water chemistry in the study area is not significantly affected by nitrate contamination and it is mainly affected by evaporation and crystallization, dissolution and filtration and alternate cation adsorption. The groundwater quality in the study area is generally poor, which is mainly influenced by geological conditions and human activities, among which, NO-3 pollution is more serious. The water quality is gradually improved from south to north and from mountainous areas to plains. Nitrate pollution in groundwater can pose a threat to human health and children have a higher health risk due to nitrate production than adults. [ABSTRACT FROM AUTHOR]

Water-derived high iodine groundwater is a typical primary low-quality water, which poses a serious threat to drinking water safety. Taking the pore water in the central Taiyuan Basin as the research object, the characteristics of high iodine groundwater in the study area were analyzed by collecting 57 sets of groundwater samples in the study area, and the characteristics of high iodine groundwater in the study area were analyzed by comprehensively using the methods of Piper three-line diagram, correlation analysis and element ratio, and the enrichment process was discussed. The results show that the excessive iodine content in groundwater mainly occurs in the pore water of the alluvial plain, and the maximum I-mass concentration is 1128.0 μg/L; the horizontal zonation of high-iodine groundwater is obvious, and the I-mass concentration gradually increases along the groundwater flow direction; the vertical distribution is The characteristics show that with the increase of the burial depth of the water-bearing rock group, the average mass concentration of I- gradually decreases; the hydrochemical type of the high-iodine groundwater is mainly HCO3-Na type, and the groundwater components related to I- are Na+, TDS, Cl -, TOC, HCO-3, pH and ORP; alkaline weakly reducing sedimentary environment, rock weathering, groundwater runoff intensity, organic matter degradation, and competitive adsorption are the natural factors for iodine enrichment in pore water in Taiyuan Basin. Induced overcurrent recharge and stratigraphic mining are important external causes of iodine enrichment in pore water in the Taiyuan Basin. [ABSTRACT FROM AUTHOR]