Arsenic in the Multi-aquifer System of the Mekong Delta, Vietnam: Analysis of Large-Scale Spatial Trends and Controlling Factors

Erban, Laura; Gorelick, Steven M.; Fendorf, Scott

doi:10.1021/es403932t

Cited by 26 publications

(9 citation statements)

References 46 publications

(86 reference statements)

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“…Water ages and solute concentrations are closely connected concepts; groundwater depletion may alter the chemical composition of pumped well waters. Coupling time series of fossil and modern water fractions to time series of solute concentrations in heavily exploited aquifers could evaluate the ways groundwater pumping impacts groundwater quality (Erban et al, ; Smith et al, ) and its potential to induce land subsidence (Su et al, ).…”

Section: Fossil Groundwatermentioning

confidence: 99%

Global Isotope Hydrogeology―Review

Jasechko

2019

Reviews of Geophysics

186

116

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Groundwater 18O/16O, 2H/1H, 13C/12C, 3H, and 14C data can help quantify molecular movements and chemical reactions governing groundwater recharge, quality, storage, flow, and discharge. Here, commonly applied approaches to isotopic data analysis are reviewed, involving groundwater recharge seasonality, recharge elevations, groundwater ages, paleoclimate conditions, and groundwater discharge. Reviewed works confirm and quantify long held tenets: (i) that recharge derives disproportionately from wet season and winter precipitation; (ii) that modern groundwaters comprise little global groundwater; (iii) that “fossil” (>12,000‐year‐old) groundwaters dominate global aquifer storage; (iv) that fossil groundwaters capture late‐Pleistocene climate conditions; (v) that surface‐borne contaminants are more common in younger groundwaters; and (vi) that groundwater discharges generate substantial streamflow. Groundwater isotope data are disproportionately common to midlatitudes and sedimentary basins equipped for irrigated agriculture, but less plentiful across high latitudes, hyperarid deserts, and equatorial rainforests. Some of these underexplored aquifer systems may be suitable targets for future field testing.

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Section: Fossil Groundwatermentioning

confidence: 99%

Global Isotope Hydrogeology―Review

Jasechko

2019

Reviews of Geophysics

186

116

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“…7,13 Previous studies noted that sediment age can be important with respect to redox processes due to the preferential consumption of the most reactive components of sedimentary organic carbon by microbes over time. [38][39][40] In support of this hypothesis, McMahon et al 13 found that for aquifers composed of similar lithologies, concentrations of methane, dissolved organic carbon, and ammonium were higher in the aquifers with younger sediments than in aquifers with older sediments.…”

Section: Discussionmentioning

confidence: 94%

Methane emissions from groundwater pumping in the USA

Kulongoski

McMahon

2019

npj Clim Atmos Sci

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Atmospheric methane accumulation contributes to climate change, hence quantifying methane emissions is essential to assess and model the impacts. Here, we estimate methane emissions from groundwater pumping in the Los Angeles Basin (LAB), northeastern Pennsylvania, and the Principal aquifers of the USA using the average concentrations of methane in groundwater and annual groundwater pumping volumes. High average methane concentrations, 44.1 mg/L, and extensive groundwater pumping,~3.1 × 10 11 L/a in the LAB, result in the annual emission of~2.9 × 10 −3 Tg of microbial methane. Ethane emissions in the LAB were 3.5 × 10 −6 Tg/a. Lower methane emissions estimated for NE Pennsylvania,~3.0 × 10 −6 Tg/a, reflect lower methane concentrations and groundwater pumping, 0.7 mg/L and 4.27 × 10 9 L/a, respectively. Methane concentrations and groundwater withdrawals, 1.06 × 10 14 L/a, across the USA enabled the estimation of the total emissions of methane from Principal aquifers (92% of total pumping) of 0.044 Tg/a in the year 2000, which represents a small percentage (~0.2%) of the total annual US methane emissions, but a previously unquantified flux in the global methane budget. Globally, groundwater-pumping methane emissions were estimated to be 0.53 Tg/a, 0.2% of global methane emissions, by adopting a global estimate for groundwater extraction, and an average methane concentration in older groundwater of 0.44 mg/L.

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“…Similarly, studies in the United States have reported higher levels of uranium [15] and arsenic [151] in its aquifers. India, Bangladesh and Vietnam have widespread arsenic contamination in groundwater used for drinking and irrigation, especially in areas where the use of contaminated water has led to contaminated soils and crops [152][153][154]. Presently there are no federal guidelines regulating geogenic contaminant levels in irrigation water except in the case of direct wastewater reuse [155,156].…”

Section: Geogenic Contaminants In Irrigation Watermentioning

confidence: 99%

Irrigation Water Quality—A Contemporary Perspective

Malakar

Snow

Ray

2019

Water

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In the race to enhance agricultural productivity, irrigation will become more dependent on poorly characterized and virtually unmonitored sources of water. Increased use of irrigation water has led to impaired water and soil quality in many areas. Historically, soil salinization and reduced crop productivity have been the primary focus of irrigation water quality. Recently, there is increasing evidence for the occurrence of geogenic contaminants in water. The appearance of trace elements and an increase in the use of wastewater has highlighted the vulnerability and complexities of the composition of irrigation water and its role in ensuring proper crop growth, and long-term food quality. Analytical capabilities of measuring vanishingly small concentrations of biologically-active organic contaminants, including steroid hormones, plasticizers, pharmaceuticals, and personal care products, in a variety of irrigation water sources provide the means to evaluate uptake and occurrence in crops but do not resolve questions related to food safety or human health effects. Natural and synthetic nanoparticles are now known to occur in many water sources, potentially altering plant growth and food standard. The rapidly changing quality of irrigation water urgently needs closer attention to understand and predict long-term effects on soils and food crops in an increasingly fresh-water stressed world.

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Arsenic in the Multi-aquifer System of the Mekong Delta, Vietnam: Analysis of Large-Scale Spatial Trends and Controlling Factors

Cited by 26 publications

References 46 publications

Global Isotope Hydrogeology―Review

Global Isotope Hydrogeology―Review

Methane emissions from groundwater pumping in the USA

Irrigation Water Quality—A Contemporary Perspective

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