A comparative study of the effect of desferrioxamine B, oxalic acid, and Na-alginate on the desorption of U(VI) from goethite at pH 6 and 25°C

Wolff-Boenisch, Domenik; Traina, Samuel J.

doi:10.1016/j.gca.2006.06.1565

Cited by 26 publications

(14 citation statements)

References 50 publications

(69 reference statements)

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“…The maximal surface loading of DFOB on Fh equaled 0.12 lmol/m 2 , which is up to 3.5 times higher than values published for goethite at mildly acid conditions (Kraemer et al, 1999;Cocozza et al, 2002;Cheah et al, 2003;Reichard et al, 2007). However, also about 2-fold larger values of DFOB surface loading on goethite at pH 6 have been reported (Wolff-Boenisch and Traina, 2006). Thus, there seems to be no systematic difference in the DFOB surface loading of our Fh and goethite at near neutral pH.…”

Section: Sorption Of Dfob and Fe(iii)-dfob To Polymers A Pga Coprecicontrasting

confidence: 51%

Synthetic coprecipitates of exopolysaccharides and ferrihydrite. Part II: Siderophore-promoted dissolution

Mikutta

Kretzschmar

2008

Geochimica et Cosmochimica Acta

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Section: Sorption Of Dfob and Fe(iii)-dfob To Polymers A Pga Coprecicontrasting

confidence: 51%

Synthetic coprecipitates of exopolysaccharides and ferrihydrite. Part II: Siderophore-promoted dissolution

Mikutta

Kretzschmar

2008

Geochimica et Cosmochimica Acta

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“…However, the dominant DFOB species in the range of pH of this study (2-6) is the positively charged H 4 DFOB + species that might have been able to adsorb to biotite. However, although it has been demonstrated previously that the presence of DFOB promotes Al and Fe release to solution (Hersman et al, 1995;Holmén and Casey, 1996;Kraemer et al, 1999;Cocozza et al, 2002;Cheah et al, 2003;Kraemer, 2004;Buss et al, 2007;Reichard et al, 2007;;Wolff-Boenisch and Traina, 2007a,b), its actual adsorption to the dissolving matrix has been discussed to be insufficient (3%) to account for the observed increase in dissolution rates, probably because of steric hindrance (Wolff-Boenisch and Traina, 2006).…”

Section: Ph and Organic Ligand Dependent Element Releasementioning

confidence: 91%

The effect of pH, grain size, and organic ligands on biotite weathering rates

Bray

Oelkers

Bonneville

et al. 2015

Geochimica et Cosmochimica Acta

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101

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Biotite dissolution rates were determined at 25°C, at pH 2-6, and as a function of mineral composition, grain size, and aqueous organic ligand concentration. Rates were measured using both open-and closed-system reactors in fluids of constant ionic strength. Element release was non-stoichiometric and followed the general trend of Fe, Mg > Al > Si. Biotite surface area normalised dissolution rates (r i ) in the acidic range, generated from Si release, are consistent with the empirical rate law:where k H,i refers to an apparent rate constant, a H þ designates the activity of protons, and x i stands for a reaction order with respect to protons. Rate constants range from 2.15 Â 10 À10 to 30.6 Â 10 À10 (moles biotite m À2 s À1 ) with reaction orders ranging from 0.31 to 0.58. At near-neutral pH in the closed-system experiments, the release of Al was stoichiometric compared to Si, but Fe was preferentially retained in the solid phase, possibly as a secondary phase. Biotite dissolution was highly spatially anisotropic with its edges being $120 times more reactive than its basal planes. Low organic ligand concentrations slightly enhanced biotite dissolution rates. These measured rates illuminate mineral-fluid-organism chemical interactions, which occur in the natural environment, and how organic exudates enhance nutrient mobilisation for microorganism acquisition.

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“…which do not interact directly with surface cations, might not affect the release of those elements from the glass , and might even decrease the possible effect of ligands on cation solubilities, stopping the cations from being removed (Kraemer, 2004). Previous studies have shown that goethite dissolution rates reach a plateau at OA concentrations above 5 mM (Cheah et al, 2003) and 1 mM (Wolff-Boenisch and Traina, 2006). Considering the respective specific surface area and bulk concentration of their material, the number of OA molecules ideally adsorbed per surface unit of goethite (without taking into account possible steric constraints) would range from 2.9 to 14.3 lmol m À2 .…”

Section: Ligand Concentrations and Saturation Effectmentioning

confidence: 99%