Arsenic and associated trace-elements in groundwater from the Chaco-Pampean plain, Argentina: Results from 100years of research

Nicolli, Hugo; Bundschuh, Jochen; Blanco, María del Carmen del Vando; Tujchneider, Ofelia; Panarello, Héctor O.; Dapeña, Cristina; Rusansky, Jorge E.

doi:10.1016/j.scitotenv.2012.04.048

Cited by 166 publications

(90 citation statements)

References 29 publications

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“…For instance, the shallow groundwater of the Chaco Pampean Plain of Argentina spans 10 6 km 2 and contains 10 to 5300 μg As/L [34]. A variety of As remediation methods were reviewed recently [35,36]; these methods have shown varying success rates.…”

Section: Arsenic Chemistry Geochemistry Prevalence and Toxicitymentioning

confidence: 99%

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

2014

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A review of the literature about calculating the adsorption properties of arsenic onto mineral models using density functional theory (DFT) is presented. Furthermore, this work presents DFT results that show the effect of model charge, hydration, oxidation state, and DFT method on the structures and adsorption energies for As (oxyhydr)oxide cluster models were calculated using planewave and cluster-model DFT methods.

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Section: Arsenic Chemistry Geochemistry Prevalence and Toxicitymentioning

confidence: 99%

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

2014

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“…Arsenic may be found in soil as inorganic species as well as binding to organic compounds; however, it exists predominantly as inorganic species in soil. Inorganic As compounds may undergo methylation by microorganisms, producing, under oxidizing conditions, monomethylarsonic acid, dimethylarsinic acid, and trimethylarsine oxide [2,45,46]. Principle factors affecting the level of As in soils include the parent rock, climate, organic and inorganic components of the soil, and redox potential status [41,47].…”

Section: Occurrence Of Arsenic In Soilmentioning

confidence: 99%

“…Eh-pH diagrams (also known as Pourbaix diagrams) conventionally are used to represent and describe the speciation of As and its environmentally significant geochemical processes [5,46]. Figure 1 shows the Eh-pH diagram of aqueous As species in water at 25°C.…”

Section: Speciation Of Arsenicmentioning

confidence: 99%

“…A population of more than 1.2 million in rural Argentina depends on groundwater where As concentration exceeds the WHO guideline as well as the national drinking water standard of 10 μg/L [77,78]. The most affected regions are extensive areas of the Pampean Plain, some parts of the Chaco Plain, and some small areas of the Andean range, where drinking water wells contain 50 to 15, 000 μg/L of As [30,46,70,[76][77][78][79][80][81][82][83]. The sedimentary aquifers in this region comprise Tertiary aeolian loess-type sediments in the Pampean Plain and predominantly fluvial sediments of Tertiary and Quaternary age in the Chaco region.…”

Section: Latin Americamentioning

confidence: 99%

“…The sedimentary aquifers in this region comprise Tertiary aeolian loess-type sediments in the Pampean Plain and predominantly fluvial sediments of Tertiary and Quaternary age in the Chaco region. Drinking water for the rural populations is supplied by the shallow aquifers and contains around 200 μg/L of As (nearly 30 % as As) as well as high concentrations of fluoride (2.1 mg/L) [30,46,70,[76][77][78][79][80][81][82][83].…”

Section: Latin Americamentioning

confidence: 99%

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Natural Arsenic in Global Groundwaters: Distribution and Geochemical Triggers for Mobilization

et al. 2016

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The elevated concentration of arsenic (As) in the groundwaters of many countries worldwide has received much attention during recent decades. This article presents an overview of the natural geochemical processes that mobilize As from aquifer sediments into groundwater and provides a concise description of the distribution of As in different global groundwater systems, with an emphasis on the highly vulnerable regions of Southeast Asia, the USA, Latin America, and Europe. Natural biogeochemical processes and anthropogenic activities may lead to the contamination of groundwaters by increased As concentrations. The primary source of As in groundwater is predominantly natural (geogenic) and mobilized through complex biogeochemical interactions within various aquifer solids and water. Sulfide minerals such as arsenopyrite and As-substituted pyrite, as well as other sulfide minerals, are susceptible to oxidation in the near-surface environment and quantitatively release significant quantities of As in the sediments. The geochemistry of As generally is a function of its multiple oxidation states, speciation, and redox transformation. The reductive dissolution of As-bearing Fe(III) oxides and sulfide oxidation are the most common and significant geochemical triggers that release As from aquifer sediments into groundwaters. The mobilization of As in groundwater is controlled by adsorption onto metal oxyhydroxides and clay minerals. According to recent estimates, more than 130 million people worldwide potentially are exposed to As in drinking water at levels above the World Health Organization's (WHO's) guideline value of 10 μg/L. Hence, community education to strengthen public awareness, the involvement and capacity building of local stakeholders in targeting As-safe aquifers, and direct action and implementation of best practices in identifying safe groundwater sources for the installation of safe drinking water wells through action and enforcement by local governments and international water sector professionals are urgent necessities for sustainable As mitigation on a global scale.

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Harnessing Biogeochemical Principals for Remediation of Selenium‐Contaminated Soils

Cooper¹

2021

Selenium Contamination in Water

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Arsenic and associated trace-elements in groundwater from the Chaco-Pampean plain, Argentina: Results from 100years of research

Cited by 166 publications

References 29 publications

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

Arsenic Adsorption onto Minerals: Connecting Experimental Observations with Density Functional Theory Calculations

Natural Arsenic in Global Groundwaters: Distribution and Geochemical Triggers for Mobilization

Harnessing Biogeochemical Principals for Remediation of Selenium‐Contaminated Soils

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