Origin and Chemical Characteristics of Groundwater in Tumed Left Banner,Inner Mongolia
Utilizing the groundwater system theory and hydrogeochemical analysis methodology,this study used Tumed Left Banner(Tumote Zuoqi)in Inner Mongolia as an example to reveal the origin and chemical characteristics of groundwater in arid and semi-arid regions.The results show that:(1)The groundwater in the study area was generally alkaline and mostly in a reducing environment.(2)The main hydrochemical types of phreatic water were HCO3-Ca water,with minor amounts of Cl-Ca water,HCO3-Mg water,HCO3-Na and Cl-Na water.The predominant hydrochemical type of confined water was HCO3-Ca water,with minor amounts of HCO3-Na water,HCO3-Mg water and Cl-Ca water.(3)Phreatic water was mainly influenced by water-rock interaction and evaporation,while confined water was mainly affected by water-rock interaction.(4)The main sources of arsenic in the study area were fine-grained river and lake sediments as well as arsenic enriched rock formations in Daqing Mountain.The most prevalent arsenic species was H3AsO3 The reductive dissolution of Fe and Mn oxides,competitive adsorption between HCO3 and H3AsO3,along with slow groundwater velocity were the main causes of arsenic enrichment in groundwater.
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