Contrasting distributions of groundwater arsenic and uranium in the western Hetao basin, Inner Mongolia: Implication for origins and fate controls

Guo, Huaming; Jia, Yongfeng; Wanty, Richard B.; Jiang, Yunfeng; Zhao, Weiguang; Xiu, Wei; Shen, Jiaxing; Li, Yuan; Cao, Yingjie; Wu, Yang; Zhang, Di; Wei, Chao; Zhang, Yilong; Cao, Wengeng; Foster, Andrea L.

doi:10.1016/j.scitotenv.2015.10.018

Cited by 97 publications

(53 citation statements)

References 117 publications

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“…Previous studies have shown that aquifers can be divided into three zones (H.M. Guo, Jia, et al, 2016b;: an alluvial fan, transition area, and flat plain ( Figure 1c). The length of the investigated flow path was around 5,000 m, with distances 0-2,000 m occurring in the alluvial fan, 2000-3000 m in the transition area, and 3000-5000 m in the flat plain (Figures 1b and 1c).…”

Section: Study Areamentioning

confidence: 97%

“…Sample Fan#1-18 (brown fine sand) was taken at a depth of 17.9-18.0 m and sample Plain#1-78 (gray fine sand) was sampled at a depth of 77.9-78.0 m (Figure 1b). In the study area, our previous study using the XANES technique showed that As(V) (67-90%) was the major As species in oxic-suboxic sediments near the alluvial fan, while As (III) (67-81%) prevailed in gray sediments under reducing conditions in the flat plain (H.M. Guo, Jia, et al, 2016b). Accordingly, As(V) adsorption on sample Fan#1-18 and As (III) adsorption on sample Plain#1-78 were investigated by a series of laboratory batch experiments to evaluate As adsorption isotherms, pH effects, and competitive adsorption by HCO 3 − and PO 4 3− .…”

Section: Arsenic Adsorption and Desorption Experiments And Scmmentioning

confidence: 98%

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Quantifying Geochemical Processes of Arsenic Mobility in Groundwater From an Inland Basin Using a Reactive Transport Model

Gao

Jia

Guo

et al. 2020

Water Resources Research

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High arsenic (As) groundwater is frequently found in inland basins, yet the contributions of different processes to aqueous As distributions remain unresolved. In the Hetao Basin, a typical inland basin, groundwater As concentrations generally increased from the alluvial fan through the transition area to the flat plain. A geochemical process‐based reactive transport model was established to evaluate and quantify the processes of As mobilization in the northwestern Hetao Basin. Thirty‐six groundwater samples and eight sediment samples were collected from the alluvial fan to the flat plain to investigate the geochemical characteristics of the groundwater system. Along the approximate flow path, groundwater evolved from oxic‐suboxic conditions to anoxic conditions, with increasing concentrations of As, Fe (II), and NH4+, and decreasing Eh and SO42−/Cl−. Modeling results indicated that the observed concentrations of Fe (II) were caused by reductive dissolution of Fe (III) oxides and subsequent precipitation of mackinawite and siderite. Reductive dissolution of Fe (III) oxides was primarily driven by organic matter degradation (>75%), followed by H2S oxidation (<25%). More As was sequestered by mackinawite precipitation and adsorption than that released via abiotic reduction of Fe (III) oxides by H2S. Reductive dissolution of Fe (III) oxides was the dominant mechanism for liberating As in both the transition area and the flat plain (>70%), and As desorption under elevated pH and competitive adsorption by HCO3− and PO43− made an important contribution to As enrichment (up to 30%). Overall, this study provides an insight into the relative contributions of different geochemical processes to As enrichment in inland basins.

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Section: Study Areamentioning

confidence: 97%

Section: Arsenic Adsorption and Desorption Experiments And Scmmentioning

confidence: 98%

Quantifying Geochemical Processes of Arsenic Mobility in Groundwater From an Inland Basin Using a Reactive Transport Model

Gao

Jia

Guo

et al. 2020

Water Resources Research

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“…A hydrogeological unit (around 5000 m long), which is located in the west of the Hetao basin near the Langshan Mountain, was selected to conduct this study. Previous studies showed that the unit could be divided into three zones approximately along the flow path, with 0-2000 m in the alluvial fan, 2000-3000 m in the transition area, and 3000-5000 m in the flat plain [10,13]. Aquifer sediments were mainly composed of quartz, feldspar, muscovite, clay minerals, carbonates (mainly calcite and dolomite), and gypsum [10,12].…”

Section: The Study Areamentioning

confidence: 99%

“…Previous studies showed that the unit could be divided into three zones approximately along the flow path, with 0-2000 m in the alluvial fan, 2000-3000 m in the transition area, and 3000-5000 m in the flat plain [10,13]. Aquifer sediments were mainly composed of quartz, feldspar, muscovite, clay minerals, carbonates (mainly calcite and dolomite), and gypsum [10,12]. A series of geochemical dissolution procedures [7] were carried out to quantify sedimentary Fe(III) oxides in four representative sediments, with Fe(III) oxide contents ranging between 46.4 and 143 mmol/kg (unpublished data).…”

Section: The Study Areamentioning

confidence: 99%

“…The Hetao basin, as a typical inland basin, hosted high As groundwater (As around 1000 μg/L) [9]. Previous studies showed that high groundwater As was mostly attributed to reductive dissolution of As-bearing Fe(III) oxides [10]. However, geochemical processes related to As mobilization should be different in the Hetao basin, since weakly alkaline pH and high concentrations of SO4 2was observed, compared to the river deltas with nearneutral pH and quite low SO4 2concentrations [11].…”

Section: Introductionmentioning

confidence: 99%

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Arsenic mobilization in the piedmont area of the Hetao basin: an insight from a reactive transport model

et al. 2019

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Groundwater showed a trend from oxic-suboxic conditions in the alluvial fan to anoxic conditions in the flat plain in the Hetao basin, with increases in As, Fe2+, NH4+, alkalinity and pH, and decreases in Eh and NO3-. A 1D reactive transport model was constructed using a model flow column by PHREEQC to quantitatively interpret geochemical processes related to As mobilization in a 5000 m-long hydrogeological unit. Results indicated that groundwater As concentration was mostly controlled by Fe(III) oxide reduction and As adsorption processes. Observed Fe2+ was the combination of Fe(III) oxide reduction and mackinawite/siderite precipitation. Increasing alkalinity was the result of oxidation of organic carbon, rather than the dissolution of carbonates.

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Bioelectrochemical Systems for Heavy Metal Pollution Control and Resource Recovery

Zhang

Jiao

Wang

2020

Bioelectrosynthesis

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Contrasting distributions of groundwater arsenic and uranium in the western Hetao basin, Inner Mongolia: Implication for origins and fate controls

Cited by 97 publications

References 117 publications

Quantifying Geochemical Processes of Arsenic Mobility in Groundwater From an Inland Basin Using a Reactive Transport Model

Quantifying Geochemical Processes of Arsenic Mobility in Groundwater From an Inland Basin Using a Reactive Transport Model

Arsenic mobilization in the piedmont area of the Hetao basin: an insight from a reactive transport model

Bioelectrochemical Systems for Heavy Metal Pollution Control and Resource Recovery

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