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dc.contributor.authorPanther, Jared G
dc.contributor.authorBennett, William W
dc.contributor.authorTeasdale, Peter R
dc.contributor.authorWelsh, David T
dc.contributor.authorZhao, Huijun
dc.date.accessioned2017-05-03T12:18:29Z
dc.date.available2017-05-03T12:18:29Z
dc.date.issued2012
dc.identifier.issn0013-936X
dc.identifier.doi10.1021/es203674n
dc.identifier.urihttp://hdl.handle.net/10072/49102
dc.description.abstractAluminum is acutely toxic, and elevated concentrations of dissolved Al can have detrimental effects on both terrestrial and aquatic ecosystems. Robust analytical methods that can determine environmentally relevant Al fractions accurately and efficiently are required by the environmental monitoring community. A simple, robust passive sampling method, the diffusive gradients in thin films (DGT) technique, was evaluated for the measurement of dissolved Al species in freshwater and marine water using either Chelex-100 or Metsorb (a titanium dioxide-based binding agent) as the adsorbent. Mass vs time DGT deployments at pH 5.05 (Al3+ and Al(OH)2+ dominate) and 8.35 (Al(OH)4 - dominates) demonstrated linear uptake of Al (R2 = 0.989 and 0.988, respectively) for Metsorb. Similar deployments of Chelex-DGT showed linear uptake at pH 5.05 (R2 = 0.994); however, at pH 8.35 the mass of Al accumulated was 40-70% lower than predicted, suggesting that Chelex-100 is not suitable for Al measurements at high pH. The Metsorb-DGT measurement was independent of pH (5.0-8.5) and ionic strength (0.001-0.7 mol L-1 NaNO3), whereas the Chelex-DGT measurement was only independent of ionic strength at pH 5.0. At pH 8.4, increasing ionic strength led to considerable underestimation (up to 67%) of Al concentration. Deployments of Metsorb-DGT (up to 4 days) in synthetic freshwater (pH range 5.4-8.1) and synthetic seawater (pH 8.15) resulted in linear mass uptakes, and the concentration measured by DGT agreed well with solution concentrations. Conversely, deployment of Chelex-DGT in synthetic seawater and freshwater (pH =7.7 Al(OH)4 - dominant species) resulted in a decrease in accumulated mass with increasing deployment time. In situ field evaluations in fresh, estuarine, and marine waters confirmed that Metsorb-DGT was more accurate than Chelex-DGT for the measurement of dissolved Al in typical environmental waters.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent896537 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherAmerican Chemical Society
dc.publisher.placeUnited States
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom2267
dc.relation.ispartofpageto2275
dc.relation.ispartofissue4
dc.relation.ispartofjournalEnvironmental Science & Technology
dc.relation.ispartofvolume46
dc.rights.retentionY
dc.subject.fieldofresearchSensor technology (incl. chemical aspects)
dc.subject.fieldofresearchcode340108
dc.titleDGT Measurement of Dissolved Aluminum Species in Waters: Comparing Chelex-100 and Titanium Dioxide-Based Adsorbents
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/es203674n.
gro.date.issued2015-07-30T23:09:11Z
gro.hasfulltextFull Text
gro.griffith.authorZhao, Huijun
gro.griffith.authorBennett, Will W.


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