Association of arsenic and phosphorus with iron nanoparticles between streams and aquifers: implications for arsenic mobility

Hartland, Adam, Larsen, Joshua R., Andersen, Martin S., Baalousha, Mohammed and O'Carroll, Denis (2015) Association of arsenic and phosphorus with iron nanoparticles between streams and aquifers: implications for arsenic mobility. Environmental Science and Technology, 49 24: 14101-14109. doi:10.1021/acs.est.5b03506


Author Hartland, Adam
Larsen, Joshua R.
Andersen, Martin S.
Baalousha, Mohammed
O'Carroll, Denis
Title Association of arsenic and phosphorus with iron nanoparticles between streams and aquifers: implications for arsenic mobility
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 1520-5851
0013-936X
Publication date 2015-12-15
Year available 2015
Sub-type Article (original research)
DOI 10.1021/acs.est.5b03506
Open Access Status Not Open Access
Volume 49
Issue 24
Start page 14101
End page 14109
Total pages 9
Place of publication Washington, DC United States
Publisher American Chemical Society
Language eng
Subject 1600 Chemistry
2304 Environmental Chemistry
Abstract The microbial oxidation of organic matter coupled to reductive iron oxide dissolution is widely recognized as the dominant mechanism driving elevated arsenic (As) concentrations in aquifers. This paper considers the potential of nanoparticles to increase the mobility of As in aquifers, thereby accounting for discrepancies between predicted and observed As transport reported elsewhere. Arsenic, phosphorus, and iron size distributions and natural organic matter association were examined along a flow path from surface water via the hyporheic zone to shallow groundwater. Our analysis demonstrates that the colloidal Fe concentration (>1 kDa) correlates with both colloidal P and colloidal As concentrations. Importantly, increases in the concentration of colloidal P (>1 kDa) were positively correlated with increases in the concentration of nominally dissolved As (<1 kDa), but no correlation was observed between colloidal As and nominally dissolved P. This suggests that P actively competes for adsorption sites on Fe nanoparticles, displacing adsorbed As, thus mirroring their interaction with Fe oxides in the aquifer matrix. Dynamic redox fronts at the interface between streams and aquifers may therefore provide globally widespread conditions for the generation of Fe nanoparticles, a mobile phase for As adsorption currently not a part of reactive transport models.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Official 2016 Collection
 
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