Geochemical controls of elevated arsenic concentrations in groundwater, Ester Dome, Fairbanks district, Alaska

Verplanck, Philip L.; Mueller, Seth; Goldfarb, Richard J.; Nordstrom, D. Kirk; Youcha, E. K.

doi:10.1016/j.chemgeo.2008.06.020

Cited by 54 publications

(38 citation statements)

References 29 publications

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“…The leaching of Fe oxides via microbial dissimilatory reduction under anaerobic conditions can cause the release of As. In addition, secondary minerals, such as scorodite, can be dissolved through reductive dissolution, allowing Fe(II), As(III), or As(V) ions to be leached out (Papassiopi et al 2003;Verplanck et al 2008). …”

Section: Mineralogical Composition and Results Of Sem-eds And Epmamentioning

confidence: 99%

Geochemical and microbial effects on the mobilization of arsenic in mine tailing soils

Lee

Kim

2009

Environ Geochem Health

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Arsenic (As) contamination has become a serious environmental problem in many countries. We have performed batch-type leaching experiments on mine tailing soils collected from three abandoned mine areas in South Korea with the objective of evaluating the effect of indigenous bacterial activity on As mobilization. The analysis of physicochemical properties and mineralogical compositions of the samples indicated that the secondary minerals or phases formed as a result of the oxidation or alteration of primary minerals were associated with the labile and bioleachable fractions of As. Compared to simulated abiotic processes using sterilization, the indigenous bacteria activated using a carbon source were able to enhance the dissolution of As under both aerobic and anaerobic conditions. The bacterial dissolution of iron (Fe) and manganese (Mn) was found to occur simultaneously with the dissolution of As, suggesting that the main bacterial mechanism was via the dissimilatory reduction of Fe(III), Mn(IV), and As(V). An anaerobic environment was more favorable for the prominent dissolution of As in the tailing soils. These results indicate that the mobilization of As can be enhanced in the oxygen-depleted part of the tailing dump, particularly with the infiltration of organic substrates. The difference in the degree of As lixiviation between the three tailing soils was found to be related to the bioavailability of As as well as the original biomass in the tailing soils.

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Section: Mineralogical Composition and Results Of Sem-eds And Epmamentioning

confidence: 99%

Geochemical and microbial effects on the mobilization of arsenic in mine tailing soils

Lee

Kim

2009

Environ Geochem Health

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“…Very high concentrations of aqueous arsenic are achievable under these conditions, however its mobilisation is heavily restricted due to the strong adsorptive capacity of metal oxides in soils/sediments, especially in the presence of iron (Fe) oxides (Scanlon et al 2009;. Although, under oxidising conditions and high pH (~ 8.5 -9.5), arsenic is often less strongly bound to Fe oxides than at lower pH ranges, allowing for an enhanced mobility (Verplanck et al 2008). If these conditions persist in aquifer environments, elevated aqueous arsenic concentrations may be a widespread occurrence.…”

Section: Introductionmentioning

confidence: 99%

Arsenic contamination of natural waters in San Juan and La Pampa, Argentina

O'Reilly

Watts

Shaw

et al. 2010

Environ Geochem Health

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Arsenic (As) speciation in surface and groundwater from two provinces in Argentina (San Juan and La Pampa) was investigated using solid phase extraction (SPE) cartridge methodology with comparison to total arsenic concentrations. A third province, Río Negro, was used as a control to the study. Strong cation exchange (SCX) and strong anion exchange (SAX) cartridges were utilised in series for the separation and preservation of arsenite (As ). Samples were collected from a range of water outlets (rivers/streams, wells, untreated domestic taps, well water treatment works) to assess the relationship between total arsenic and arsenic species, water type and water parameters (pH, conductivity and total dissolved solids, TDS). Analysis of the waters for arsenic (total and species) was performed by inductively coupled plasma mass spectrometry (ICP-MS) in collision cell mode. Total arsenic concentrations in the surface and groundwater from Encon and the San José de Jáchal region of San Juan (north-west Argentina within the Cuyo region) ranged from 9 -357 μg l -1As. Groundwater from Eduardo Castex (EC) and Ingeniero Luiggi (LU) in La Pampa (central Argentina within the Chaco-Pampean Plain) ranged from 3 -1326 μg l -1As. The pH range for the provinces of San Juan (7.2 -9.7) and La Pampa (7.0 -9.9) are in agreement with other published literature. The highest total arsenic concentrations were found in La Pampa well waters (both rural farms and pre-treated urban sources), particularly where there was high pH (typically > 8.2), conductivity (> 2600 μS cm As. Arsenic species for both provinces were predominantly As for groundwater, respectively. This translates to a relative As III abundance of 69 -100 % of the total arsenic in surface waters and 32 -100 % in groundwater. This is unexpected because it is typically thought that in oxidising conditions (surface waters), the dominant arsenic species is As V . However, data from the SPE methodology suggests that As III is the prevalent species in San Juan, indicating a greater influence from reductive processes. La Pampa groundwater had As (equating to up to 33 % of the total arsenic). Previously published literature has focused primarily on the inorganic arsenic species, however this study highlights the potentially significant concentrations of organoarsenicals present in natural waters. The potential for separating and preserving individual arsenic species in the field to avoid transformation during transport to the laboratory, enabling an accurate assessment of in-situ arsenic speciation in water supplies is discussed.

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“…As population grows, groundwater resources are being increasingly exploited for drinking water (Verplanck et al 2008). It is estimated that approximately one-third of the world's population use groundwater for drinking (UNEP 1999).…”

Section: Introductionmentioning

confidence: 99%

Groundwater geochemistry in the Meshkinshahr basin of Ardabil province in Iran

et al. 2011

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The chemical analysis of 59 water wells in Meshkinshar area, Ardabil province NW of IRAN has been evaluated to determine the hydrogeochemical processes and ion concentration background in the region. The dominated hydrochemical types are Na-SO 4 , Ca-HCO 3 , Na-HCO 3 and Na-Cl in the whole area. Based on the total hardness, the groundwater is soft. According to electrical conductivity and sodium adsorption ratio, the most dominant classes are C1-S1, C2-S1 and C3-S1. The major ion concentrations are below the acceptable level for drinking water. The groundwater salinity hazard is medium to high but the Na hazard is low to medium and in regard of irrigation water the quality is low to medium. So the drainage system is necessary to avoid the increase of toxic salt concentrations.

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Geochemical controls of elevated arsenic concentrations in groundwater, Ester Dome, Fairbanks district, Alaska

Cited by 54 publications

References 29 publications

Geochemical and microbial effects on the mobilization of arsenic in mine tailing soils

Geochemical and microbial effects on the mobilization of arsenic in mine tailing soils

Arsenic contamination of natural waters in San Juan and La Pampa, Argentina

Groundwater geochemistry in the Meshkinshahr basin of Ardabil province in Iran

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