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Role of competing ions in the mobilization of arsenic 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 of arsenic in groundwater of Bengal Basin. Water research. 55, 30-39
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Official URL: http://doi.org/10.1016/j.watres.2014.02.002

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 the competing ions, PO4 3- 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. (C) 2014 Elsevier Ltd. All rights reserved.

Authors/Creators: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
Title:Role of competing ions in the mobilization of arsenic in groundwater of Bengal Basin
Subtitle:insight from surface complexation modeling
Series/Journal:Water research (0043-1354)
Year of publishing :2014
Volume:55
Page range:30-39
Number of Pages:10
Publisher:IWA Publishing
ISSN:0043-1354
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Accepted version
Full Text Status:Public
Agris subject categories.:P Natural resources > P10 Water resources and management
P Natural resources > P30 Soil science and management
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geochemistry
Agrovoc terms:water, arsenic, ions, models
Keywords:Bengal Basin, Groundwater, Arsenic mobilization, Temporal variability, Competing ions, Surface complexation modeling
URN:NBN:urn:nbn:se:slu:epsilon-e-2299
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-2299
Additional ID:
Type of IDID
Web of Science (WoS)000335201500004
DOI10.1016/j.watres.2014.02.002
ID Code:11575
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:13 Jan 2015 14:33
Metadata Last Modified:12 Apr 2015 05:21

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