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Cited by 182 publications
(80 citation statements)
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References 40 publications
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“…Al and Mn oxides has also been reported (Gupta and Chen, 1978;Rothwell et al, 2009;Smedley and Kinniburgh, 2002;Sracek et al, 2004). This association with Fe is also indicated in the present study since there is a significant correlation between As and Fe in many of the streams.…”
Section: Modelled Speciationsupporting
confidence: 70%
See 1 more Smart Citation
“…Al and Mn oxides has also been reported (Gupta and Chen, 1978;Rothwell et al, 2009;Smedley and Kinniburgh, 2002;Sracek et al, 2004). This association with Fe is also indicated in the present study since there is a significant correlation between As and Fe in many of the streams.…”
Section: Modelled Speciationsupporting
confidence: 70%
“…In order to better understand the regulation of As and V concentrations in the streams, the geochemical model Visual MINTEQ was used in an attempt to determine the speciation of As and V. Several studies have shown that geochemical models like MINTEQ, WHAM and PHREEQC generally predict the dominant metal species with reasonable accuracy (e.g. Davis et al, 1994;Lumsdon et al, 2001;Sracek et al, 2004;Unsworth et al, 2006). In the present study, we used a modelling approach similar to the one used recently by Sjöstedt et al (2009), who found reasonable agreement between dialysis results for 3 lakes and a model that considered trace metal binding to DOM as well as to colloidal ferrihydrite.…”
Section: Introductionmentioning
confidence: 99%
“…As the pH increased, the amount of As dissolved also increased. This observation is likely due to As binding to iron oxides in oxidizing environments (Hartley et al, 2004;Sracek et al, 2004); the surface charge of the iron oxides changes with pH from positive charge at lower pH values, which attracts the anions to negative charge at higher pH values, which then repels the anions.…”
Section: Oxyanionsmentioning
confidence: 99%
“…However, it is important to point out that the speciation model calculates saturation indices based on chemical equilibrium between minerals and water and assumes very fast reactions. Speciation calculations are complicated by uncertainty in the values of thermodynamic constants for mineral phases, as only pure phases are considered in the available databases and equilibrium constants of naturally occurring solidsolutions may differ significantly from these values (Sracek et al, 2004). Nevertheless, the model gives useful information on the possible suite of mineral phases controlling As in solution under certain defined physicochemical conditions.…”
Section: Thermodynamic Calculationsmentioning
confidence: 99%