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Role of competing ions in the mobilization of arsenic in groundwater of Bengal Basin: Insight from surface complexation modeling
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. (KTH - International Groundwater Arsenic Research Group)
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. (KTH - International Groundwater Arsenic Research Group)ORCID iD: 0000-0001-8771-7941
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. (KTH - International Groundwater Arsenic Research Group)
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2014 (English)In: Water Research, ISSN 0043-1354, E-ISSN 1879-2448, Vol. 55, 30-39 p.Article in journal (Refereed) Published
Abstract [en]

This study assesses the role of competing ions in the mobilization of arsenic (As) by surface complexation modeling of the temporal variability of As in groundwater. The potential use of two different surface complexation models (SCMs), developed for ferrihydrite and goethite, has been explored to account for the temporal variation of As(III) and As(V) concentration, monitored in shallow groundwater of Bengal Basin over a period of 20 months. The SCM for ferrihydrite appears as the better predictor of the observed variation in both As(III) and As(V) concentrations in the study sites. It is estimated that among the competing ions, PO43- is the major competitor of As(III) and As(V) adsorption onto Fe oxyhydroxide, and the competition ability decreases in the order PO43- >> Fe(II) > H4SiO4 = HCO- (3.) It is further revealed that a small change in pH can also have a significant effect on the mobility of As(III) and As(V) in the aquifers. A decrease in pH increases the concentration of As(III), whereas it decreases the As(V) concentration and vice versa. The present study suggests that the reductive dissolution of Fe oxyhydroxide alone cannot explain the observed high As concentration in groundwater of the Bengal Basin. This study supports the view that the reductive dissolution of Fe oxyhydroxide followed by competitive sorption reactions with the aquifer sediment is the processes responsible for As enrichment in groundwater.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 55, 30-39 p.
Keyword [en]
Bengal Basin, Groundwater, Arsenic mobilization, Temporal variability, Competing ions, Surface complexation modeling
National Category
Water Treatment
Identifiers
URN: urn:nbn:se:kth:diva-145803DOI: 10.1016/j.watres.2014.02.002ISI: 000335201500004Scopus ID: 2-s2.0-84896893120OAI: oai:DiVA.org:kth-145803DiVA: diva2:721556
Note

QC 20140604

Available from: 2014-06-04 Created: 2014-06-02 Last updated: 2017-12-05Bibliographically approved

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Gustafsson, Jon PetterBhattacharya, Prosun

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