title: Identification of the hydrogeochemical processes and assessment of groundwater quality using classic integrated geochemical methods in the Southeastern part of Ordos basin, China.
abstract: Insufficient understanding of the hydrogeochemistry of aquifers makes it necessary to conduct a preliminary water quality assessment in the southern region of Ordos Basin, an arid area in the world. In this paper, the major ions of groundwater have been studied aiming at evaluating the hydrogeochemical processes that probably affect the groundwater quality using 150 samples collected in 2015. The two prevalent hydrochemical facies, HCO3Mg·Na·Ca and HCO3Mg·Ca·Na type water, have been identified based on the hydrochemical analysis from Piper trilinear diagram. Compositional relations have been used to assess the origin of solutes and confirm the predominant hydrogeochemical processes responsible for the various ions in the groundwater. The results show that the ions are derived from leaching effect, evaporation and condensation, cation exchange, mixing effect and human activities. Finally groundwater quality was assessed with single factor and set pair methods, the results indicate that groundwater quality in the study region is generally poor in terms of standard of national groundwater quality. The results obtained in this study will be useful to understand the groundwater quality status for effective management and utilization of the groundwater resource.
authors.affiliation: Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, PR China. Electronic address: qyang@udc.es.
authors.forename: Qingchun
authors.initials: Q
authors.lastname: Yang
authors.affiliation: Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, PR China.
authors.forename: Zijun
authors.initials: Z
authors.lastname: Li
authors.affiliation: Key Laboratory for Groundwater and Ecology in Arid and Semi-arid Areas, Xi'an Center of Geological Survey, CGS, Xi'an 130021, PR China.
authors.forename: Hongyun
authors.initials: H
authors.lastname: Ma
authors.affiliation: Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, PR China.
authors.forename: Luchen
authors.initials: L
authors.lastname: Wang
authors.affiliation: Escuela de Ingenieros de Caminos, Universidad de A Coruña, Campus de Elviña, 15192, Spain.
authors.forename: Jordi Delgado
authors.initials: JD
authors.lastname: Martín
mesh_terms: D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D060587:Groundwater / Q000737:chemistry* / Q000592:standards*; D006802:Human Activities; D006801:Humans; D007477:Ions / Q000032:analysis; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*; D060753:Water Quality; D014881:Water Supply / Q000592:standards*
chemical_list: D007477:Ions; D014874:Water Pollutants, Chemical
keywords: Hydrogeochemistry; Ionic ratio coefficient; PCA; Southeastern part of Ordos basin; Water quality assessment