| 内蒙古哈素海区域高砷地下水化学特征及其成因 |
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| 关键词:high-arsenic water arsenic speciation reducing environment PHREEQC competitive adsorption |
| 基金项目:内蒙古“一湖两海”科技重大专项项目(编号: ZDZX2018054);内蒙古自治区自然科学基金项目(编号: 2018MS04004);国家自然科学基金项目(编号: 41562020) |
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| Hydrogeochemical Characteristics and Genesis of High-arsenic Groundwater in Hasuhai Area, Inner Mongolia |
| High-arsenic groundwater in Hasuhai area poses a serious threat to the safety of drinking water for local residents. Elucidating its formation and evolution mechanism is of great significance to the scientific and sustainable development and utilization of water resources and the protection of the health of local residents. Based on hydrogeological investigations, we herein employed Piper diagrams, arsenic speciation calculations using PHREEQC, and correlation analysis to investigate high-arsenic groundwater. We studied the hydrogeochemical characteristics and constructed an arsenic speciation model (SM) and arsenic sorption model (HSM) to reveal the genetic mechanism of high-arsenic groundwater in the study area. Arsenic concentrations were found to vary between 0.2 and 231.5 μg/L, and high arsenic groundwater was mainly distributed in the alluvial plain south of Daqingshan Mountain. As(Ⅲ) was the main type of arsenic in shallow groundwater in the study area. SM showed that H3AsO3 was the dominant form of arsenic in the study area, whereas HSM showed that there were two main forms of arsenic, H3AsO3 and Hfo_wH2AsO3. Arsenic in groundwater may originate from the dissolution and weathering of the surrounding arsenic-rich rocks and Quaternary arsenic-rich fluvial and lacustrine sediments. The fluvial and lacustrine sedimentary environment in the study area is conducive to the formation of high-arsenic water, and the weakly alkaline reducing environment dominated by the decomposition of organic matter is the main driver of the transfer of arsenic from aquifers to groundwater. Additionally, the competitive adsorption of HCO– 3 promotes the release of arsenic. |
| FENG Yan-bo,DONG Shao-gang,LEI Jun-hao,ZHANG Min,WANG Kun.2023.Hydrogeochemical Characteristics and Genesis of High-arsenic Groundwater in Hasuhai Area, Inner Mongolia[J].Acta Geoscientica Sinica,44(3):522-530. |
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