Arsenic pollution of groundwater in Vietnam exacerbated by deep aquifer exploitation for more than a century
Open Access
- 18 January 2011
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 108 (4), 1246-1251
- https://doi.org/10.1073/pnas.1011915108
Abstract
Arsenic contamination of shallow groundwater is among the biggest health threats in the developing world. Targeting uncontaminated deep aquifers is a popular mitigation option although its long-term impact remains unknown. Here we present the alarming results of a large-scale groundwater survey covering the entire Red River Delta and a unique probability model based on three-dimensional Quaternary geology. Our unprecedented dataset reveals that ∼7 million delta inhabitants use groundwater contaminated with toxic elements, including manganese, selenium, and barium. Depth-resolved probabilities and arsenic concentrations indicate drawdown of arsenic-enriched waters from Holocene aquifers to naturally uncontaminated Pleistocene aquifers as a result of > 100 years of groundwater abstraction. Vertical arsenic migration induced by large-scale pumping from deep aquifers has been discussed to occur elsewhere, but has never been shown to occur at the scale seen here. The present situation in the Red River Delta is a warning for other As-affected regions where groundwater is extensively pumped from uncontaminated aquifers underlying high arsenic aquifers or zones.Keywords
This publication has 37 references indexed in Scilit:
- Impact of sulfate reduction on the scale of arsenic contamination in groundwater of the Mekong, Bengal and Red River deltasApplied Geochemistry, 2009
- Hydrogeological survey assessing arsenic and other groundwater contaminants in the lowlands of Sumatra, IndonesiaApplied Geochemistry, 2008
- Geochemical processes underlying a sharp contrast in groundwater arsenic concentrations in a village on the Red River delta, VietnamApplied Geochemistry, 2008
- Comparison of arsenic concentrations in simultaneously-collected groundwater and aquifer particles from Bangladesh, India, Vietnam, and NepalApplied Geochemistry, 2008
- Evaluation of the sustainability of deep groundwater as an arsenic-safe resource in the Bengal BasinProceedings of the National Academy of Sciences of the United States of America, 2008
- Holocene evolution of the Song Hong (Red River) delta system, northern VietnamSedimentary Geology, 2006
- Introduction: Controls on arsenic transport in near-surface aquatic systemsChemical Geology, 2006
- Water Manganese Exposure and Children’s Intellectual Function in Araihazar, BangladeshEnvironmental Health Perspectives, 2006
- Natural organic matter in sedimentary basins and its relation to arsenic in anoxic ground water: the example of West Bengal and its worldwide implicationsApplied Geochemistry, 2004
- Partitioning of arsenic and metals in reducing sulfidic sedimentsEnvironmental Science & Technology, 1988