Model predictions of metal speciation in freshwaters compared to measurements by in situ techniques.

2.50
Hdl Handle:
http://hdl.handle.net/10029/7168
Title:
Model predictions of metal speciation in freshwaters compared to measurements by in situ techniques.
Authors:
Unsworth, Emily R; Warnken, Kent W; Zhang, Hao; Davison, William; Black, Frank; Buffle, Jacques; Cao, Jun; Cleven, Rob; Galceran, Josep; Gunkel, Peggy; Kalis, Erwin; Kistler, David; Leeuwen, Herman P van; Martin, Michel; Noël, Stéphane; Nur, Yusuf; Odzak, Niksa; Puy, Jaume; Riemsdijk, Willem van; Sigg, Laura; Temminghoff, Erwin; Tercier-Waeber, Mary-Lou; Toepperwien, Stefanie; Town, Raewyn M; Weng, Liping; Xue, Hanbin
Abstract:
Measurements 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.
Citation:
Environ. Sci. Technol. 2006, 40(6):1942-9
Issue Date:
15-Mar-2006
URI:
http://hdl.handle.net/10029/7168
PubMed ID:
16570619
Type:
Article
Language:
en
ISSN:
0013-936X
Appears in Collections:
Environment

Full metadata record

DC FieldValue Language
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.en
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-

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