Pathways of coupled arsenic and iron cycling in high arsenic groundwater of the Hetao basin, Inner Mongolia, China: An iron isotope approach

Guo, Huaming; Liu, Chen; Lu, Hai; Wanty, Richard B.; Wang, Jun; Zhou, Yuxin

doi:10.1016/j.gca.2013.02.031

Cited by 109 publications

(62 citation statements)

References 82 publications

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“…Kirk et al, 2010), while pyrite did not dissolve in the pH 3 solution used in the extractions. In our previous study (H.M. Guo et al, 2013), relatively low As and Fe (II) concentrations and high H 2 S and δ 56 Fe were observed in the same transition area. The enrichment of heavy δ 56 Fe in groundwater in the transition area reflects the formation of pyrite (H.M. Guo et al, 2013).…”

Section: 1029/2019wr025492mentioning

confidence: 52%

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: 1029/2019wr025492mentioning

confidence: 52%

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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“…In general, larger ranges of δ 56 Fe values have been found for marine sediment pore waters (-3.5 to 1.1‰, n=150, Fehr et al, 2008;Homoky et al, 2009;Scholz et al, 2014a;2014b;Severmann et al, 2006;Staubwasser et al, 2006) and brackish pore waters in estuaries (-5.0 to 0.7‰, n=48, Rouxel et al, 2008;Roy et al, 2012). In comparison, pore waters in aquifers and mine drainage settings show a narrower range in δ 56 Fe values (-2.4 to -0.2‰, n=22, Guo et al, 2013;Herbert Jr and Schippers, 2008;Tangalos et al, 2010;Teutsch et al, 2005;Xie et al, 2013;, which is similar to that for lake systems (-2.1 to 0.5‰, n=52). The negative…”

Section: The Greatest Difference In δ 56mentioning

confidence: 94%

Iron isotope fractionation in sediments of an oligotrophic freshwater lake

Couture

et al. 2015

Earth and Planetary Science Letters

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“…The highly As(V)-contaminated groundwater typically contains Fe(II) with concentrations ranging from 0.05 to 44.3 mg L −1 [13][14][15][16]. In areas with serious arsenic contamination, the molar ratio of As:Fe can reach 0.03 [17].…”

Section: Introductionmentioning

confidence: 99%

Formation of iron (hydr)oxides during the abiotic oxidation of Fe(II) in the presence of arsenate

Song

Jia

Chen

et al. 2015

Journal of Hazardous Materials

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Pathways of coupled arsenic and iron cycling in high arsenic groundwater of the Hetao basin, Inner Mongolia, China: An iron isotope approach

Cited by 109 publications

References 82 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

Iron isotope fractionation in sediments of an oligotrophic freshwater lake

Formation of iron (hydr)oxides during the abiotic oxidation of Fe(II) in the presence of arsenate

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