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Role of competing i...
Role of competing ions in the mobilization of arsenic in groundwater of Bengal Basin : Insight from surface complexation modeling
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- Biswas, Ashis (författare)
- KTH,Mark- och vattenteknik
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- Gustafsson, Jon Petter (författare)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,KTH,Mark- och vattenteknik,Institutionen för mark och miljö,Department of Soil and Environment
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Neidhardt, Harald (författare)
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- Halder, Dipti (författare)
- KTH,Mark- och vattenteknik
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Kundu, Amit K. (författare)
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Chatterjee, Debashis (författare)
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Berner, Zsolt (författare)
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- Bhattacharya, Prosun (författare)
- KTH,Mark- och vattenteknik
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(creator_code:org_t)
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- Elsevier, 2014
- 2014
- Engelska.
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Ingår i: Water Research. - : Elsevier. - 0043-1354 .- 1879-2448. ; 55, s. 30-39
- Relaterad länk:
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http://www.sciencedi...
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https://kth.diva-por... (primary) (Raw object)
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https://pub.epsilon....
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https://pub.epsilon.... (primary) (Raw object) (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Miljöbioteknik -- Vattenbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Environmental Biotechnology -- Water Treatment (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Nyckelord
- Bengal Basin
- Groundwater
- Arsenic mobilization
- Temporal variability
- Competing ions
- Surface complexation modeling
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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