| Summary: | The chemical components and formation mechanism are of great significance for groundwater evolution, reasonable exploitation, and the quality evaluation of water resources.To clarify the water quality characteristics and its control factors of shallow groundwater in the northern Henan Plain, different types of water samples were collected, and the anion, cation and hydrogen and oxygen isotopic compositions of the water samples were tested, respectively.The results show that: ① The range of groundwater TDS is 316-6 948 mg/L, and the brackish and saline groundwater are in the center of alluvial and diluvial plain of Qinhe river, along the area of Sanyang Town to Xiuwu County, with the major water types of HCO3·SO4·Cl-Na·Mg and SO4-Na·Mg.In the northern alluvial fan landform and the north shore of Qinhe River, groundwater is freshen with the water type of HCO3-Ca·Mg.② The hydrogen and oxygen isotopic composition of groundwater indicates that groundwater originates from atmospheric precipitation and the evolution of chemical components are dominated by water-rock interactions.The groundwater is controlled by carbonate leaching in the recharge area, the weathering of silicate and cation exchange occur in the runoff area, and the drainage area is dominated by evaporation, gypsum dissolution and concentration and cation exchange.To a certain extent, it is also affected by human activities.③ The geological condition and climate are the main cause of the formation of saline groundwater, and also it is affected by leakage of industrial and agricultural sewage.The results can provide a basis for the rational exploitation and offective management of groundwater resources in this area.
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