ArticleNature communications2020
Arsenic contamination of Bangladesh aquifers exacerbated by clay layers.
Article in Nature communications, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed.
- Advected carbon younger than the sediment fuels microbial metabolism in a pumped deep aquifer.Communications earth & environment · 2026Article
- Surface Variable-Based Machine Learning for Scalable Arsenic Prediction in Undersampled Areas.GeoHealth · 2026Article
- Geothermal Arsenic Threats to Intensive Groundwater Utilization in an Arid Basin.Environmental science & technology · 2025Article
- Anthropogenic impacts on the terrestrial subsurface biosphere.Nature reviews. Microbiology · 2025Review
- Hotspots of Dissolved Arsenic Generated from Buried Silt Layers along Fluctuating Rivers.Environmental science & technology · 2024Article
- Sources, effects and present perspectives of heavy metals contamination: Soil, plants and human food chain.Heliyon · 2024Review
- Widespread aquifer depressurization after a century of intensive groundwater use in USA.Science advances · 2023Article
- Microbial utilization of recently fixed, plant-derived organic carbon in shallow Holocene and Pleistocene aquifers in Bangladesh.Organic geochemistry · 2023Article
- Article
- Natural and Anthropogenic Processes Affecting Domestic Groundwater Quality within the Northwestern Appalachian Basin.Environmental science & technology · 2022Article
- Review
- Dissimilatory Fe(III) Reduction Controls on Arsenic Mobilization: A Combined Biogeochemical and NanoSIMS Imaging Approach.Frontiers in microbiology · 2021Article
- Aquifer-Scale Observations of Iron Redox Transformations in Arsenic-Impacted Environments to Predict Future Contamination.Environmental science & technology letters · 2020Article
- Origin of Groundwater Arsenic in a Rural Pleistocene Aquifer in Bangladesh Depressurized by Distal Municipal Pumping.Water resources research · 2020Article
- Bacterial and Archaeal Diversity and Abundance in Shallow Subsurface Clay Sediments at Jianghan Plain, China.Frontiers in microbiology · 2020Article
Corrections and comments
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Authors and funding
10 authors.
Funding
Abstract
Confining clay layers typically protect groundwater aquifers against downward intrusion of contaminants. In the context of groundwater arsenic in Bangladesh, we challenge this notion here by showing that organic carbon drawn from a clay layer into a low-arsenic pre-Holocene (>12 kyr-old) aquifer promotes the reductive dissolution of iron oxides and the release of arsenic. The finding explains a steady rise in arsenic concentrations in a pre-Holocene aquifer below such a clay layer and the repeated failure of a structurally sound community well. Tritium measurements indicate that groundwater from the affected depth interval (40-50 m) was recharged >60 years ago. Deeper (55-65 m) groundwater in the same pre-Holocene aquifer was recharged only 10-50 years ago but is still low in arsenic. Proximity to a confining clay layer that expels organic carbon as an indirect response to groundwater pumping, rather than directly accelerated recharge, caused arsenic contamination of this pre-Holocene aquifer.
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