Spatial and temporal evolution of groundwater arsenic contamination in the Red River delta, Vietnam: Interplay of mobilisation and retardation processes

Stopelli, Emiliano; Duyen, Vu Thi; Tran, Thanh-Dai; Trang, Pham Thi Kim; Viet, Pham Hung; Lightfoot, Alexandra; Kipfer, Rolf; Schneider, M.; Eiche, Elisabeth; Kontny, Agnes; Neumann, Thomas; Głodowska, Martyna; Patzner, Monique; Kappler, Andreas; Kleindienst, Sara; Rathi, Bhasker; Cirpka, Olaf A.; Bostick, Benjamín C.; Prommer, Henning; Winkel, Lenny H. E.; Berg, Michael

doi:10.1016/j.scitotenv.2020.137143

Cited by 65 publications

(64 citation statements)

References 41 publications

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“…Arsenic-bearing Fe(III) minerals 18,19 and groundwater containing high As, Fe, and CH 4 , low SO 4 2− , and no NO 3 − were reported (Fig. 1b) 20 . In situ gas measurements demonstrated that the Total dissolved gas pressure (TDGP) correlates with As concentrations and CH 4 accounts for the majority of detected gases in the groundwater (Fig.…”

Section: Resultsmentioning

confidence: 96%

“…1a). The lithology, geology, mineralogy, characterization, and distribution of organic carbon were described previously [17][18][19]29,30,20 . Briefly, the North-Western part is characterized by Pleistocene aquifer sands and the groundwater is slightly reduced with As concentrations below the WHO guideline (10 µg/L), whereas the South-Eastern part is of strongly reduced younger gray Holocene sands and the groundwater exceeds the 10 µg/L limit by factors of 10-50 (ref.…”

Section: Resultsmentioning

confidence: 99%

“…19 ). The transition between the contaminated and uncontaminated zones is characterized by changing redox conditions (redox transition zone) where elevated concentrations of CH 4 of up to 45 mg/L were reported 20 .…”

Section: Resultsmentioning

confidence: 99%

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Arsenic mobilization by anaerobic iron-dependent methane oxidation

Straub

Jetten

Głodowska

et al. 2020

Commun Earth Environ

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Arsenic groundwater contamination threatens the health of millions of people worldwide, particularly in South and Southeast Asia. In most cases, the release of arsenic from sediment was caused by microbial reductive dissolution of arsenic-bearing iron(III) minerals with organic carbon being used as microbial electron donor. Although in many arsenic-contaminated aquifers high concentrations of methane were observed, its role in arsenic mobilization is unknown. Here, using microcosms experiments and hydrogeochemical and microbial community analyses, we demonstrate that methane functions as electron donor for methanotrophs, triggering the reductive dissolution of arsenic-bearing iron(III) minerals, increasing the abundance of genes related to methane oxidation, and ultimately mobilizing arsenic into the water. Our findings provide evidence for a methane-mediated mechanism for arsenic mobilization that is distinct from previously described pathways. Taking this together with the common presence of methane in arsenic-contaminated aquifers, we suggest that this methane-driven arsenic mobilization may contribute to arsenic contamination of groundwater on a global scale.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

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Arsenic mobilization by anaerobic iron-dependent methane oxidation

Straub

Jetten

Głodowska

et al. 2020

Commun Earth Environ

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“…This seawater affects groundwater flow, ionic strength, and, critically, provides sulphate for sulphate reduction, potentially inducing the precipitation of As sulphides. The contamination at this site is extreme, and potentially different from most recent research examining As environments that are affected by geogenic contamination [27,44,45]. Therefore, the scope of the present study is centered around a vertical high resolution sediment and groundwater characterization that allowed to define detailed depth profiles of the contaminant distribution [46].…”

Section: Introductionmentioning

confidence: 97%

Redox Dependent Arsenic Occurrence and Partitioning in an Industrial Coastal Aquifer: Evidence from High Spatial Resolution Characterization of Groundwater and Sediments

Sbarbati

Barbieri

Barron

et al. 2020

Water

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Superlative levels of arsenic (As) in groundwater and sediment often result from industrial pollution, as is the case for a coastal aquifer in Southern Italy, with a fertilizer plant atop. Understanding conditions under which As is mobilized from the sediments, the source of that As, is necessary for developing effective remediation plans. Here, we examine hydrogeological and geochemical factors that affect groundwater As concentrations in a contaminated coastal aquifer. Groundwater has been subject to pump-and-treat at a massive scale for more than 15 years and is still ongoing. Nevertheless, As concentrations (0.01 to 100 mg/L) that are four orders of magnitude more than Italian drinking water standard of 10 μg/L are still present in groundwater collected from about 50 monitoring wells over three years (2011, 2016, and 2018). As was quantified in three different locations by sequential extractions of 29 sediment cores in 2018 (depth 2.5 m to −16.5 m b.g.l.), combined with groundwater As composition, the aqueous and solid partitioning of As were evaluated by partition coefficient (Kd) in order to infer the evolution of the contaminant plumes. Most sediment As is found in easily extractable and/or adsorbed on amorphous iron oxides/hydroxides fractions based on sequential extractions. The study shows that As contamination persists, even after many years of active remediation due to the partitioning to sediment solids. This implies that the choice of remediation techniques requires an improved understanding of the biogeochemical As-cycling and high spatial resolution characterization of both aqueous and solid phases for sites of interest.

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“…Groundwater quality evaluation is the chief and urgent operation prior to utilization. Therefore, hydrogeochemical compositions of groundwater and their influencing factors are considered as the essential information for fully understanding groundwater quality and have been attracting massive attentions from ordinary people, academic fields, as well as government [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Multivariate Analysis and Geochemical Signatures of Shallow Groundwater in the Main Urban Area of Chongqing, Southwestern China

Chen

Tang

Jian

et al. 2020

Water

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Hydrogeochemical processes and quality assessment for shallow groundwater are pivotal issues to be solved in many regions over the world due to the easy access of shallow groundwater. In this study, eighty-six water samples were collected from shallow aquifers of Chongqing, China, during July–September 2019. Multivariate statistical techniques, major ion ratios, and geochemical modeling were integrated to investigate hydrogeochemical characteristics and controlling factors. Afterwards, groundwater quality in spatial was classified by entropy-weighted water quality index and geographic information system (GIS) spatial analysis. Groundwater samples were alkaline and possessed high total dissolved solids (TDS) values. Two-group samples were distinguished as mix cations-HCO3-SO4 (group 1) and Ca-Mg-SO4 (group 2) facies. Hydrogeochemical compositions of group 1 samples were dominated by silicate dissolution and ion exchange, while sulfate and calcite dissolution were the main factors influencing the hydrogeochemical characteristics of group 2. The overall quality of groundwater samples varied greatly from excellent quality to extremely poor quality. Group 1 samples were found with excellent and good quality and suitable for drinking purposes. Group 2 samples were all unsuitable for direct drinking purposes as the quality varied from medium to extremely poor, but were spatially limited. Groundwaters with relatively poor quality were due to dissolution of sulfate that were locally enriched in the aquifers. The new findings of this study are expected to provide the reference for future management and sustainable exploitation of groundwater in Chongqing.

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Spatial and temporal evolution of groundwater arsenic contamination in the Red River delta, Vietnam: Interplay of mobilisation and retardation processes

Cited by 65 publications

References 41 publications

Arsenic mobilization by anaerobic iron-dependent methane oxidation

Arsenic mobilization by anaerobic iron-dependent methane oxidation

Redox Dependent Arsenic Occurrence and Partitioning in an Industrial Coastal Aquifer: Evidence from High Spatial Resolution Characterization of Groundwater and Sediments

Multivariate Analysis and Geochemical Signatures of Shallow Groundwater in the Main Urban Area of Chongqing, Southwestern China

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