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dc.contributor.authorBennett, Willen_US
dc.contributor.authorTeasdale, Peteren_US
dc.contributor.authorPanther, Jareden_US
dc.contributor.authorWelsh, Daviden_US
dc.contributor.authorZhao, Huijunen_US
dc.contributor.authorF. Jolley, Dianneen_US
dc.date.accessioned2017-05-03T12:18:30Z
dc.date.available2017-05-03T12:18:30Z
dc.date.issued2012en_US
dc.identifier.issn0013936Xen_US
dc.identifier.doi10.1021/es204484ken_US
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.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_US
dc.format.extent1095829 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen_US
dc.language.isoen_US
dc.publisherAmerican Chemical Societyen_US
dc.publisher.placeUnited Statesen_US
dc.relation.ispartofstudentpublicationNen_US
dc.relation.ispartofpagefrom3981en_US
dc.relation.ispartofpageto3989en_US
dc.relation.ispartofissue7en_US
dc.relation.ispartofjournalEnvironmental Science & Technologyen_US
dc.relation.ispartofvolume46en_US
dc.rights.retentionYen_US
dc.subject.fieldofresearchEnvironmental Monitoringen_US
dc.subject.fieldofresearchEnvironmental Chemistry (incl. Atmospheric Chemistry)en_US
dc.subject.fieldofresearchSoil Chemistry (excl. Carbon Sequestration Science)en_US
dc.subject.fieldofresearchcode050206en_US
dc.subject.fieldofresearchcode039901en_US
dc.subject.fieldofresearchcode050304en_US
dc.titleInvestigating Arsenic Speciation and Mobilization in Sediments with DGT and DET: A Mesocosm Evaluation of Oxic-Anoxic Transitionsen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.facultyGriffith Sciences, Griffith School of Environmenten_US
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.en_US
gro.date.issued2015-07-30T23:04:34Z
gro.hasfulltextFull Text


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