Role of competing ions in the mobilization ofarsenic in groundwater of Bengal Basin: insight from surface complexation modeling

Biswas, Ashis and Gustafsson, Jon Petter and Neidhardt, Harald and Halder, Dipti and Kundu, Amit K. and Chatterjee, Debashis and Berner, Zsolt and Bhattacharya, Prosun (2014) Role of competing ions in the mobilization ofarsenic in groundwater of Bengal Basin: insight from surface complexation modeling. Water Research, 55. pp. 30-39. ISSN 0043-1354

Abstract

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 thecompeting ions, PO43- is the major competitor of As(III) and As(V) adsorption onto Feoxyhydroxide, and the competition ability decreases in the order PO43-≫Fe(II)>H4SiO4=HCO3 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. © 2014 Elsevier Ltd.


Statistics for USQ ePrint 36019
Statistics for this ePrint Item
Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 13 May 2019 05:27
Last Modified: 30 May 2019 02:08
Uncontrolled Keywords: arsenic mobilization; Bengal Basin; competing ions; groundwater; surface complexation modeling; temporal variability; competition ability; competitive sorption; reductive dissolution; surface complexation models; Aquifers; Arsenic; Dissolution; Hydrogeology; Ions; Iron compounds; Groundwater resources; ferric hydroxide; ground water; ion; ferric ion; water pollutant; aquifer; basin; complexation; enrichment; ferrihydrite; goethite; mobilization; modeling; surface; temporal variation; adsorption; analytical parameters; article; binding competition; chemical procedures; complex formation; pH; priority journal; surface complexation model; surface property; analysis; chemistry; environmental monitoring; theoretical model; Bengal; Ferric Compounds; Hydrogen-Ion Concentration; Models, Theoretical; Water Pollutants, Chemical
Fields of Research : 05 Environmental Sciences > 0599 Other Environmental Sciences > 059999 Environmental Sciences not elsewhere classified
04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology
05 Environmental Sciences > 0502 Environmental Science and Management > 050206 Environmental Monitoring
Identification Number or DOI: 10.1016/j.watres.2014.02.002
URI: http://eprints.usq.edu.au/id/eprint/36019

Actions (login required)

View Item Archive Repository Staff Only