Considerations in As analysis and speciation

Edwards, Marc; Patel, Sapna; McNeill, Laurie S.; Chen, Hsiao-wen; Frey, Michelle; Eaton, Andrew; Antweiler, Ronald C.; Taylor, Howard E.

doi:10.1002/j.1551-8833.1998.tb08402.x

Cited by 82 publications

(58 citation statements)

References 13 publications

(21 reference statements)

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“…2 it is also evident that under the experimental conditions, at the Fe(II) concentration of 7.5 mg/L, the % increment in the eluent As(T) concentration is around 10 %. This observation agrees well with the observation of Edwards et al [5]. In that experiment, the acidified solution of As(III) and As(V) containing 5.6 mg/L Fe(III) was passed through the resin column filled with acetate form resin.…”

Section: Resultssupporting

confidence: 89%

“…It is also evident that due to the exchange of H2AsO4 -by the acetate ion, the eluent pH increases due to the changes in resin surface and environment. To maintain the eluent pH value below 5, the inlet sample was acidified to 0.02 N H2SO4 [5]. The change of pH may alter the charge of the available arsenic species as shown in Tab.…”

Section: Methodsmentioning

confidence: 99%

“…The length and diameter of the resin column were 200 and 12 mm, respectively. The synthetic water sample was filtered with a 0.45 lm filter and acidified to 0.02 N H2SO4 before passing it through the column [5].…”

Section: Methodsmentioning

confidence: 99%

“…Edwards et al [5] have successfully performed arsenic speciation by using strong base anion resin separation at lower pH (below 5) followed by ICP-MS analysis. They have also reported the passage of some amount of As(V) through the resin column in the presence of Fe in the solution, which leads to a false higher value of As(T) in the eluent.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Separation of As(III) and As(V) from a Synthetic Water Solution Using Ion Exchange Columns in the Presence of Fe and Mn Ions

Mondal

Balomajumder²,

Mohanty

2007

CLEAN Soil Air Water

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The quantitative separation of As(III) from a water sample containing As(III) and As(V) in the presence of Fe and Mn in an ion exchange resin (AG1 X8) column for the speciation of arsenic is described. Individual and combined effects of Fe and Mn on the separation of As(III) from the solution have been studied separately. In absence of Fe and Mn, the ratio between the As(T) concentration in the eluent and the As(III) concentration in the original sample has been found to be 0.9717 under optimum process conditions. The presence of Fe(II) in the water sample increased the As(T) concentration in the eluent whereas Mn(II) decreased it. Combined effects of Fe and Mn on the percentage increment in the eluent arsenic concentration have been expressed by additive and interactive models. The interactive model has been developed by a statistical software with a 95 % confidence level. In most of the cases the error on the determination of the As(III) concentration had a minimum when using the interactive model.

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Section: Resultssupporting

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quantitative Separation of As(III) and As(V) from a Synthetic Water Solution Using Ion Exchange Columns in the Presence of Fe and Mn Ions

Mondal

Balomajumder²,

Mohanty

2007

CLEAN Soil Air Water

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“…However, agrochemicals containing high levels of NO 3 and PO 4 in waters have been shown to enhance/suppress MA V levels from the SPE methodology utilised in this study by as much as 13 -21 % (Watts et al [THIS ISSUE]). Previous studies on the levels of arsenic in waters have mainly reported only inorganic species (As III and As V ), in which As V was deduced from the subtraction of As III from the total arsenic level (Sigrist and Beldoménico 2004;Edwards et al 1998). This subtraction method does not account for organoarsenicals and may provide apparently elevated concentrations for As V .…”

Section: Discussionmentioning

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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Arsenic—Environmental Impact, Health Effects, and Treatment Methods

Thirunavukkarasu

Viraraghavan

2002

Kirk-Othmer Encyclopedia of Chemical Technology

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Arsenic contamination of surface and subsurface waters is reported in many parts of the world and is considered as a global issue. The enforcement of stringent arsenic standard for drinking water, because of health problems associated with the ingestion of arsenic contaminated water, call for an effective treatment technology for arsenic removal. Since the toxicity of arsenic depends on its speciation, it is essential to determine the individual arsenic species present in drinking water. Further, a better understanding of the occurrence of arsenic, health effects, and available technologies would help in the evaluation of risk and selection of an appropriate cost‐effective technology. This article provides an overview of these aspects. Various treatment methods used to remove arsenic from drinking water are also discussed.

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Considerations in As analysis and speciation

Cited by 82 publications

References 13 publications

Quantitative Separation of As(III) and As(V) from a Synthetic Water Solution Using Ion Exchange Columns in the Presence of Fe and Mn Ions

Quantitative Separation of As(III) and As(V) from a Synthetic Water Solution Using Ion Exchange Columns in the Presence of Fe and Mn Ions

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

Arsenic—Environmental Impact, Health Effects, and Treatment Methods

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