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dc.contributor.authorUnsworth, Emily R
dc.contributor.authorWarnken, Kent W
dc.contributor.authorZhang, Hao
dc.contributor.authorDavison, William
dc.contributor.authorBlack, Frank
dc.contributor.authorBuffle, Jacques
dc.contributor.authorCao, Jun
dc.contributor.authorCleven, Rob
dc.contributor.authorGalceran, Josep
dc.contributor.authorGunkel, Peggy
dc.contributor.authorKalis, Erwin
dc.contributor.authorKistler, David
dc.contributor.authorLeeuwen, Herman P van
dc.contributor.authorMartin, Michel
dc.contributor.authorNoël, Stéphane
dc.contributor.authorNur, Yusuf
dc.contributor.authorOdzak, Niksa
dc.contributor.authorPuy, Jaume
dc.contributor.authorRiemsdijk, Willem van
dc.contributor.authorSigg, Laura
dc.contributor.authorTemminghoff, Erwin
dc.contributor.authorTercier-Waeber, Mary-Lou
dc.contributor.authorToepperwien, Stefanie
dc.contributor.authorTown, Raewyn M
dc.contributor.authorWeng, Liping
dc.contributor.authorXue, Hanbin
dc.date.accessioned2007-01-10T11:30:42Z
dc.date.available2007-01-10T11:30:42Z
dc.date.issued2006-03-15
dc.identifier.citationEnviron. Sci. Technol. 2006, 40(6):1942-9en
dc.identifier.issn0013-936X
dc.identifier.pmid16570619
dc.identifier.urihttp://hdl.handle.net/10029/7168
dc.description.abstractMeasurements of trace metal species in situ in a softwater river, a hardwater lake, and a hardwater stream were compared to the equilibrium distribution of species calculated using two models, WHAM 6, incorporating humic ion binding model VI and visual MINTEQ incorporating NICA-Donnan. Diffusive gradients in thin films (DGT) and voltammetry at a gel integrated microelectrode (GIME) were used to estimate dynamic species that are both labile and mobile. The Donnan membrane technique (DMT) and hollow fiber permeation liquid membrane (HFPLM) were used to measure free ion activities. Predictions of dominant metal species using the two models agreed reasonably well, even when colloidal oxide components were considered. Concentrations derived using GIME were generally lower than those from DGT, consistent with calculations of the lability criteria that take into account the smaller time window available forthe fluxto GIME. Model predictions of free ion activities generally did not agree with measurements, highlighting the need for further work and difficulties in obtaining appropriate input data.
dc.format.extent1058708 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.titleModel predictions of metal speciation in freshwaters compared to measurements by in situ techniques.en
dc.typeArticleen
dc.format.digYES
refterms.dateFOA2018-12-18T14:53:30Z
html.description.abstractMeasurements of trace metal species in situ in a softwater river, a hardwater lake, and a hardwater stream were compared to the equilibrium distribution of species calculated using two models, WHAM 6, incorporating humic ion binding model VI and visual MINTEQ incorporating NICA-Donnan. Diffusive gradients in thin films (DGT) and voltammetry at a gel integrated microelectrode (GIME) were used to estimate dynamic species that are both labile and mobile. The Donnan membrane technique (DMT) and hollow fiber permeation liquid membrane (HFPLM) were used to measure free ion activities. Predictions of dominant metal species using the two models agreed reasonably well, even when colloidal oxide components were considered. Concentrations derived using GIME were generally lower than those from DGT, consistent with calculations of the lability criteria that take into account the smaller time window available forthe fluxto GIME. Model predictions of free ion activities generally did not agree with measurements, highlighting the need for further work and difficulties in obtaining appropriate input data.


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