Surface complexation modeling of temporal variability of arsenic in groundwater: Estimating the role of competing ions in the mobilization processes

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Surface complexation modeling of temporal variability of arsenic in groundwater : Estimating the role of competing ions in the mobilization processes

Biswas, Ashis (author): KTH,Mark- och vattenteknik

Gustafsson, Jon Petter, 1964- (author): KTH,Mark- och vattenteknik

Neidhardt, H. (author): Karlsruhe Institute of Technology, Germany

Halder, Dipti (author): KTH,Mark- och vattenteknik

Kundu, A.K. (author): University of Kalyani, India

Chatterjee, Debashis (author): University of Kalyani, India

Berner, Z. (author): Karlsruhe Institute of Technology, Germany

Bhattacharya, Prosun, 1962- (author): KTH,Mark- och vattenteknik

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(creator_code:org_t)

2013
2013
English.

Related links:: https://urn.kb.se/re...

Conference paper (peer-reviewed)

Abstract Subject headings

This study investigates the relative roles of different competing ions on the mobilization of arsenic (As) by surface complexation modeling of As rich groundwater in the aquifer of Bengal Basin. Two sets of piezometers, installed at different depths of the shallow aquifer (<50 m), have been monitored for As and other relevant hydrogeochemical parameters over a period of 20 months. The potentiality of two different surface complexation models (SCM), developed for ferrihydrite and goethite has been explored to account for the observed temporal variation in As(III) and As(V) concentration in groundwater. The SCM for ferrihydrite appears as the better predictor for the observed variation in both As(III) and As(V) concentration. It is estimated that among the competing ions PO43- is the major competitor of As(III) and As(V) adsorption into Fe oxyhydroxide and competing ability of the ions decreases as PO43- >> Fe(II) > H4SiO4 = HCO3-. The result of sensitivity test indicates that the competition of PO43- with As for the adsorption sites might already reach nearly to the stage of maxima. It is also shown that a slight increase or decrease in pH can have overwhelming effect on the mobility of As(III) and As(V) by changing their concentration oppositely. It appears that only the reductive dissolution of Fe oxyhydroxide cannot explain the observed high As concentration in the groundwater of Bengal Basin. In absence of potential competition for the adsorption sites, As released due to reductive dissolution of Fe oxyhydroxide would have been re-adsorbed into the residual Fe phases. This study suggests that the reductive dissolution of Fe oxyhydroxide followed by competitive ion exchange with the aquifer sediment is the processes conducive for As enrichment in groundwater of the sedimentary aquifers.

Subject headings

NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)

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kon (subject category)

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By the author/editor: Biswas, Ashis; Gustafsson, Jon ...; Neidhardt, H.; Halder, Dipti; Kundu, A.K.; Chatterjee, Deba ...; show more...; Berner, Z.; Bhattacharya, Pr ...; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geochemistry

By the university: Royal Institute of Technology

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