Major ion chemistry of groundwater in the extreme arid region northwest China |
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Authors: | Si Jianhua Feng Qi Wen Xiaohu Su Yonghong Xi Haiyang Chang Zongqiang |
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Institution: | (1) Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Science, No. 320 West Dong Gang Road, 730000 Lanzhou, People’s Republic of China;(2) Yantai Institute of Coastal Zone Research for Sustainable Development, Chinese Academy of Science, Yantai, 264003, People’s Republic of China |
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Abstract: | The Ejina Basin, located in arid northwest China, is one of the most arid areas in the world. In recent years, rapid development
has created a greater demand for water which is increasingly fulfilled by groundwater abstraction. Detailed knowledge of geochemical
evolution of groundwater and water quality can improve the understanding of a hydrochemical system, and promote sustainable
development and effective management of groundwater resources. To this end, a hydrochemical survey was conducted in the Ejina
Basin in order to identify the major hydrochemical characteristics. The results of chemical analysis indicate that groundwater
in the area is brackish. The major ions, TDS, and hydrochemical types of different areas are highly variable and show an obvious
zonation from the recharge area to the discharge area. Saturation index (SI), calculated according to the ionic ration plot,
indicates that the gypsum-halite dissolution reactions take place under the condition of the rock weathering to some extent,
and evaporation is the dominant factor to determine the major ionic composition in the study area. |
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Keywords: | Hydrochemical Major ions TDS Groundwater Ejina Basin Northwest China |
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