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Arsenic Levels In Groundwater Aquifer

  • PRESENT GROUNDWATER ARSENIC CONTAMINATION …

    PRESENT GROUNDWATER ARSENIC CONTAMINATION …

    Groundwater is the major drinking water source for the Terai population of southern Nepal where 47% of total population of 23 million people lives. About 200,000 shallow tube-wells are installed in the 20 districts that comprise the Terai region serving about 11 million people. Recently, arsenic contamination of the shallow groundwater aquifer has

  • Carbon and methane cycling in arsenic

    Carbon and methane cycling in arsenic

    Jul 15, 2021 Further along the groundwater flow direction, dissolved As reaches up to 540 g/L in the Holocene aquifer (Fig. 2, wells 6 to 8).The highest dissolved As concentrations are found in the wells that also show the largest concentrations of dissolved organic carbon (DOC), ammonium (NH 4 +) and dissolved methane (CH 4), that is 5–7 mg DOC/L, 50–65 mg NH 4-N/L and 40–58 mg CH 4 /L ...

  • Redox Interfaces Can Produce Toxic Arsenic Levels in ...

    Redox Interfaces Can Produce Toxic Arsenic Levels in ...

    In this study, reducing conditions were exported from from the small, sulfidic, organic-rich, clay lenses into the initially oxic aquifer sand and promoted toxic levels of arsenic release to groundwater in the aquifer sand, effectively recruiting a much larger volume of aquifer …

  • Arsenic in Groundwater: A Summary of Sources and the ...

    Arsenic in Groundwater: A Summary of Sources and the ...

    Feb 27, 2013 1.1. World-wide occurrences of arsenic–contaminated groundwater – Forms and toxicity. Arsenic (As) is a metalloid element (atomic number 33) with one naturally occurring isotope of atomic mass 75, and four oxidation states (-3, 0, +3, and +5) (Smedley and Kinniburgh, 2002).In the aqueous environment, the +3 and +5 oxidation states are most prevalent, as the oxyanions arsenite …

  • Global threat of arsenic in groundwater | Science

    Global threat of arsenic in groundwater | Science

    May 22, 2020 Arsenic is a metabolic poison that is present in minute quantities in most rock materials and, under certain natural conditions, can accumulate in aquifers and cause adverse health effects. Podgorski and Berg used measurements of arsenic in groundwater from ∼80 previous studies to train a machine-learning model with globally continuous predictor variables, including climate, soil, and ...

  • ARSENIC IN GROUNDWATER: SOURCES AND ITS IMPACTS …

    ARSENIC IN GROUNDWATER: SOURCES AND ITS IMPACTS …

    The arsenic concentration in groundwater ranges from 0.5 μg L-1 - 4730 μg L-1 (Mukherjee et al 2009).Though the sediments present in this area have very less arsenic content, the groundwater is contaminated with arsenic in toxic amounts (Acharyya et al 2000).Many researches have been carried out but no specific reason has been found regarding the contamination.

  • Arsenic unlocked: Overpumping may up contamination risk

    Arsenic unlocked: Overpumping may up contamination risk

    Jun 05, 2018 This technique could be an early warning system to prevent dangerous levels of arsenic contamination in aquifers with certain characteristics worldwide. “Arsenic in groundwater has been a problem for a really long time,” said lead author Ryan Smith, a doctoral candidate in geophysics at the School of Earth, Energy & Environmental Sciences ...

  • Integration of aquifer geology, groundwater flow and ...

    Integration of aquifer geology, groundwater flow and ...

    Mar 22, 2017 Integration of aquifer geology, groundwater flow and arsenic distribution in deltaic aquifers – A unifying concept. Mohammad A. Hoque, Corresponding Author. ... is particularly so for the discrete periods of As release to groundwater in the shallow subsurface associated with sea level high-stand conditions of Quaternary inter-glacial periods.

  • Arsenic Interactive Map for the Aquia and Piney Point aquifers

    Arsenic Interactive Map for the Aquia and Piney Point aquifers

    40km. 30mi. View Larger Map. The interactive map below provides information on the occurrence of arsenic in the Piney Point aquifer. The red shaded area is where arsenic commonly exceeds the 10 ug/L drinking water standard. Esri, HERE, Garmin, FAO, USGS, EPA, NPS.

  • ARSENIC IN GROUNDWATER: SOURCES AND ITS IMPACTS …

    ARSENIC IN GROUNDWATER: SOURCES AND ITS IMPACTS …

    The arsenic concentration in groundwater ranges from 0.5 μg L-1 - 4730 μg L-1 (Mukherjee et al 2009).Though the sediments present in this area have very less arsenic content, the groundwater is contaminated with arsenic in toxic amounts (Acharyya et al 2000).Many researches have been carried out but no specific reason has been found regarding the contamination.

  • Overpumping groundwater increases contamination risk ...

    Overpumping groundwater increases contamination risk ...

    Jun 05, 2018 June 5, 2018 Stanford researchers find groundwater pumping can increase arsenic levels in irrigation and drinking water. Pumping an aquifer to …

  • Redox Interfaces Can Produce Toxic Arsenic Levels in ...

    Redox Interfaces Can Produce Toxic Arsenic Levels in ...

    Redox Interfaces Can Produce Toxic Arsenic Levels in Groundwater from Low Arsenic-Abundance Sediments Sulfate-rich groundwater promotes formation of thioarsenates at fine-coarse sediment interfaces and increases arsenic solubility. Arsenic contamination of groundwater is a globally recognized concern but is most often considered in areas of extensive anthropogenic contamination …

  • Groundwater pumping can increase arsenic levels in ...

    Groundwater pumping can increase arsenic levels in ...

    Jun 05, 2018 Groundwater pumping can increase arsenic levels in irrigation and drinking water. Pumping an aquifer to the last drop squeezes out more than …

  • Arsenic contamination in water resources and its health ...

    Arsenic contamination in water resources and its health ...

    Arsenic (As) pollution of groundwater in various parts of the world is a result of natural and anthropogenic sources, prompting adverse impacts on human beings and …

  • River bank geomorphology controls groundwater …

    River bank geomorphology controls groundwater …

    arsenic levels [van Geen et al., 2013]. Located next to the Red River and within the influence of Hanoi’s mas-sive groundwater pumping, the aquifer at Van Phuc now receives recharge from the Red River throughout much of the year [van Geen et al., 2013; Berg et al., 2008].

  • (PDF) Groundwater flow in an arsenic

    (PDF) Groundwater flow in an arsenic

    For example, massive groundwater pumping near Hanoi has increased the level of arsenic in the aquifer through drawing in river water, which has arsenic-loaded sediment [74]. Second, household ...

  • Arsenic Contamination of Groundwater: A Review of …

    Arsenic Contamination of Groundwater: A Review of …

    Arsenic contamination of groundwater in different parts of the world is an outcome of natural and/or anthropogenic sources, leading to adverse effects on human health and ecosystem. Millions of people from different countries are heavily dependent on groundwater containing elevated level of As for drinking purposes. As contamination of groundwater, poses a serious risk to human health.

  • Arsenic in Groundwater Poses Ongoing Challenge | wrrc ...

    Arsenic in Groundwater Poses Ongoing Challenge | wrrc ...

    Aquifers in the Southwest United States are highly vulnerable to arsenic contamination due to geologic and climate conditions. Low precipitation rates and high evapotranspiration translate into slow aquifer recharge, and prolonged contact with arsenic-bearing aquifer materials allows dissolved arsenic in groundwater to reach high concentrations.

  • Extensive arsenic contamination in high

    Extensive arsenic contamination in high

    The aquifers of the Indus Plain, ho wever, are generally unconfined ... Arsenic concentrations measured in Pakistan groundwater. Arsenic exceeds the WHO guideline of 10 mg/liter in large parts of the Indus plain. The green to ... (inverse correlation) of high arsenic levels in groundwater, whereasfluvisols,soilpH ...

  • Processes conducive to the release and transport of ...

    Processes conducive to the release and transport of ...

    Dec 27, 2005 Arsenic is a contaminant in the groundwater of Holocene aquifers in Bangladesh, where ≈57 million people drink water with arsenic levels exceeding the limits set by the World Health Organization. Although arsenic is native to the sediments, the means by which it is released to groundwater remains unresolved.

  • Reducing exposure to groundwater arsenic | Homeland ...

    Reducing exposure to groundwater arsenic | Homeland ...

    Oct 12, 2011 Water Reducing exposure to groundwater arsenic. Published 12 October 2011. Well diggers in Bangladesh will soon be able to take advantage of a cell phone-based data system, developed at the Earth Institute, to target safe groundwater aquifers for installing new wells that are not tainted with arsenic. Well diggers in Araihazar, Bangladesh, will ...