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dc.contributor.authorBennett, William W
dc.contributor.authorTeasdale, Peter R
dc.contributor.authorPanther, Jared G
dc.contributor.authorWelsh, David T
dc.contributor.authorZhao, Huijun
dc.contributor.authorJolley, Dianne F
dc.date.accessioned2017-05-03T12:18:30Z
dc.date.available2017-05-03T12:18:30Z
dc.date.issued2012
dc.identifier.issn0013-936X
dc.identifier.doi10.1021/es204484k
dc.identifier.urihttp://hdl.handle.net/10072/47908
dc.description.abstractMobilization of arsenic from freshwater and estuarine sediments during the transition from oxic to anoxic conditions was investigated using recently developed diffusive sampling techniques. Arsenic speciation and Fe(II) concentrations were measured at high resolution (1-3 mm) with in situ diffusive gradients in thin films (DGT) and diffusive equilibration in thin films (DET) techniques. Water column anoxia induced Fe(II) and As(III) fluxes from the sediment. A correlation between water column Fe(II) and As(III) concentrations was observed in both freshwater (rs = 0.896, p < 0.001) and estuarine (rs = 0.557, p < 0.001) mesocosms. Porewater sampling by DGT and DET techniques confirmed that arsenic mobilization was associated with the reductive dissolution of Fe(III) (hydr)oxides in the suboxic zone of the sediment; a relationship that was visible because of the ability to measure the coincident profiles of these species using combined DGT and DET samplers. The selective measurement of As(III) and total inorganic arsenic by separate DGT samplers indicated that As(III) was the primary species mobilized from the solid phase to the porewater. This measurement approach effectively ruled out substantial As(V) mobilization from the freshwater and estuarine sediments in this experiment. This study demonstrates the capabilities of the DGT and DET techniques for investigating arsenic speciation and mobilization over a range of sediment conditions.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent1095829 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Chemical Society
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom3981
dc.relation.ispartofpageto3989
dc.relation.ispartofissue7
dc.relation.ispartofjournalEnvironmental Science & Technology
dc.relation.ispartofvolume46
dc.rights.retentionY
dc.subject.fieldofresearchAtmospheric composition, chemistry and processes
dc.subject.fieldofresearchSoil chemistry and soil carbon sequestration (excl. carbon sequestration science)
dc.subject.fieldofresearchcode370104
dc.subject.fieldofresearchcode410604
dc.titleInvestigating Arsenic Speciation and Mobilization in Sediments with DGT and DET: A Mesocosm Evaluation of Oxic-Anoxic Transitions
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, Griffith School of Environment
gro.rights.copyrightThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science & Technology, copyright 2012 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/es204484k.
gro.date.issued2015-07-30T23:04:34Z
gro.hasfulltextFull Text
gro.griffith.authorZhao, Huijun
gro.griffith.authorBennett, Will W.


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