Genome-Resolved Metagenomic Analysis of Groundwater: Insights into Arsenic Mobilization in Biogeochemical Interaction Networks

Xiu, Wei; Wu, Min; Nixon, Sophie L.; Lloyd, Jonathan R.; Bassil, Naji M.; Gai, Ruixuan; Zhan, Siyan; Guo, Huaming

doi:10.1021/acs.est.2c02623

Cited by 39 publications

(4 citation statements)

References 98 publications

(214 reference statements)

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“…The western Hetao Basin is a typical arid/semiarid region, where groundwater As enrichment (As up to 1000 μg/L) widely occurs in reducing aquifers from flat plain. 4,14,15,45 Linkages between high As groundwaters and in situ biogeochemical processes were demonstrated previously, 24,46,47 highlighting potential roles of ammonium-induced microbial Fe(III) reduction in driving As mobilization, especially in the shallow unconfined reducing aquifer in the flat plain. 4,14,15,45 Therefore, sediments from the shallow unconfined high As aquifer in the western Hetao Basin were incubated in the presence or absence of ammonium to dissect its role in As mobilization.…”

Section: ■ Introductionmentioning

confidence: 59%

“…The western Hetao Basin is a typical arid/semiarid region, where groundwater As enrichment (As up to 1000 μg/L) widely occurs in reducing aquifers from flat plain. ,,, Linkages between high As groundwaters and in situ biogeochemical processes were demonstrated previously, ,, highlighting potential roles of ammonium-induced microbial Fe(III) reduction in driving As mobilization, especially in the shallow unconfined reducing aquifer in the flat plain. ,,, Therefore, sediments from the shallow unconfined high As aquifer in the western Hetao Basin were incubated in the presence or absence of ammonium to dissect its role in As mobilization. The objectives of this study are to: (i) characterize microbial Fe(III) reduction and As mobilization induced by ammonium during microcosm incubations of the aquifer sediment; (ii) identify the key organisms associated with microbial Fe(III) reduction and As mobilization induced by ammonium using genome-resolved metagenomics; and (iii) establish potential key pathways of microbial Fe(III) reduction and As mobilization induced by ammonium within the complex biogeochemical interaction networks.…”

Section: Introductionmentioning

confidence: 94%

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Ammonium-Enhanced Arsenic Mobilization from Aquifer Sediments

Xiu,

Gai,

Chen

et al. 2024

Environ. Sci. Technol.

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Ammonium-related pathways are important for groundwater arsenic (As) enrichment, especially via microbial Fe(III) reduction coupled with anaerobic ammonium oxidation; however, the key pathways (and microorganisms) underpinning ammonium-induced Fe(III) reduction and their contributions to As mobilization in groundwater are still unknown. To address this gap, aquifer sediments hosting high As groundwater from the western Hetao Basin were incubated with 15 N-labeled ammonium and external organic carbon sources (including glucose, lactate, and lactate/acetate). Decreases in ammonium concentrations were positively correlated with increases in the total produced Fe(II) (Fe(II) tot ) and released As. The molar ratios of Fe(II) tot to oxidized ammonium ranged from 3.1 to 3.7 for all incubations, and the δ 15 N values of N 2 from the headspace increased in 15 N-labeled ammonium-treated series, suggesting N 2 as the key end product of ammonium oxidation. The addition of ammonium increased the As release by 16.1% to 49.6%, which was more pronounced when copresented with organic electron donors. Genome-resolved metagenomic analyses (326 good-quality MAGs) suggested that ammonium-induced Fe(III) reduction in this system required syntrophic metabolic interactions between bacterial Fe(III) reduction and archaeal ammonium oxidation. The current results highlight the significance of syntrophic ammonium-stimulated Fe(III) reduction in driving As mobilization, which is underestimated in high As groundwater.

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Section: ■ Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 94%

Ammonium-Enhanced Arsenic Mobilization from Aquifer Sediments

Xiu,

Gai,

Chen

et al. 2024

Environ. Sci. Technol.

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“…Some filters are also dependent upon the photo-oxidation for the removal of As(III), but such a method may not be feasible when the sunlight is scarce. As both As(III) and As(V) species occur in aqueous solution irrespective of the redox condition and exhibit different chemical properties under varying pH, − it is imperative to develop a technology that can efficiently eliminate total arsenic [both As(III) and As(V)]. In addition, some major limitations associated with the prior technologies such as high-cost, complex design, frequent clogging, replacement of the adsorbent media at regular intervals, inefficiency to operate in a high turbidity environment, and inability to lower the arsenic concentration below the World Health Organization (WHO)-maximum contaminant level (MCL) value make them unfeasible and less adoptive.…”

Section: Introductionmentioning

confidence: 99%

A Simplified and Affordable Arsenic Filter to Prevent Arsenic Poisoning: Lab-Scale Study and Pilot Experiment

Panda,

Jha,

Kumar

et al. 2023

ACS EST Water

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Access to clean and potable water is an inextricable fundamental human right. However, the contamination of groundwater with toxic arsenic has emerged as one of the global issues that is preventing millions of people from accessing their fundamental rights and healthy livelihood. Over the years, progressive effort has been made to eradicate this problem, but there are significant challenges that still remain to be addressed. Keeping the research gaps in mind, our team has developed a simplified and affordable arsenic filter (SAAF) to prevent arsenic poisoning, which has been successfully implemented in the field in the last two years (Jharkhand, India). The filtering media used in the system consist of globally available and naturally occurring iron ore fines and manganese ore as arsenic removal agents along with silverimpregnated charcoal. The developed purifier SAAF is a household gravity-based water filter that can deliver potable water at a flow rate of 10−12 L/h from highly arseniccontaminated (1−1.5 mg L −1 ) and iron-contaminated (8−10 mg L −1 ) groundwater. The low cost, simplified design, adoptable setup, promising arsenic and iron removal performance, and extended lifespan (4−5 years) of the filter demonstrate its commercial possibility and implementation potential as a front-line arsenic removal technology.

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“…+ oxidation with Fe(III) reduction (equation 6) that could potentially lead to As release. Until now however, the contribution of Feammox to As groundwater contamination was only suggested based on a positive correlation between dissolved NH 4 + , Fe and As (Gao et al 2021) or a positive correlation between genes associated with ammonium oxidation (hzsABC and hdh) and Fe(III) reduction (omcS) (Xiu et al 2022). Nevertheless, the Feammox process plays an important role in the N cycle in various ecosystems such as tropical forest soils, paddy fields, rivers, and lake sediments (Rios-Del Toro et al 2018, Li et al 2019.…”

Section: Introductionmentioning

confidence: 99%