Model predictions of metal speciation in freshwaters compared to measurements by in situ techniques.
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Authors
Unsworth, Emily RWarnken, 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
Type
ArticleLanguage
en
Metadata
Show full item recordTitle
Model predictions of metal speciation in freshwaters compared to measurements by in situ techniques.Publiekssamenvatting
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.PMID
16570619Collections
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