Crystal chemical controls on the dissolution kinetics of the isostructural sulfates: Celestite, anglesite, and barite

Dove, Patricia M.; Czank, C.A.

doi:10.1016/0016-7037(95)00116-6

Cited by 124 publications

(77 citation statements)

References 25 publications

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“…Background electrolytes have been shown to modify both the growth and the dissolution of many minerals, e.g., gypsum, calcite, barite, whewellite, among others [21,22,24,25,[41][42][43][44][45][46][47][48][49][50]. Ions at the mineral-solution interface are continuously attaching to and detaching from step edges and, consequently, mineral dissolution or growth kinetics depend on energy barriers involving these ions [51].…”

Section: Discussionmentioning

confidence: 99%

Hydration Effects on the Stability of Calcium Carbonate Pre-Nucleation Species

et al. 2017

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Recent experimental evidence and computer modeling have shown that the crystallization of a range of minerals does not necessarily follow classical models and theories. In several systems, liquid precursors, stable pre-nucleation clusters and amorphous phases precede the nucleation and growth of stable mineral phases. However, little is known on the effect of background ionic species on the formation and stability of pre-nucleation species formed in aqueous solutions. Here, we present a systematic study on the effect of a range of background ions on the crystallization of solid phases in the CaCO 3 -H 2 O system, which has been thoroughly studied due to its technical and mineralogical importance, and is known to undergo non-classical crystallization pathways. The induction time for the onset of calcium carbonate nucleation and effective critical supersaturation are systematically higher in the presence of background ions with decreasing ionic radii. We propose that the stabilization of water molecules in the pre-nucleation clusters by background ions can explain these results. The stabilization of solvation water hinders cluster dehydration, which is an essential step for precipitation. This hypothesis is corroborated by the observed correlation between parameters such as the macroscopic equilibrium constant for the formation of calcium/carbonate ion associates, the induction time, and the ionic radius of the background ions in the solution. Overall, these results provide new evidence supporting the hypothesis that pre-nucleation cluster dehydration is the rate-controlling step for calcium carbonate precipitation.

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Section: Discussionmentioning

confidence: 99%

Hydration Effects on the Stability of Calcium Carbonate Pre-Nucleation Species

et al. 2017

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“…The sediment depth z where the equilibrium Ba concentration is reached has been found to vary between 1 and 10 mm McManus et al, 1998). Dissolution of barite is a surface-controlled reaction (Berner, 1980;Dove and Czank, 1995), and the saturation depth z is therefore primarily dependent on the barite deposition flux. Accordingly, higher deposition rates of barite will result in higher Ba benthic fluxes, which has indeed been observed for the Equatorial Pacific region .…”

Section: Bottom-water Barite Saturationmentioning

confidence: 99%

Barium accumulation in the Arabian Sea: controls on barite preservation in marine sediments

Schenau¹,

Prins²,

Lange³

et al. 2001

Geochimica et Cosmochimica Acta

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Abstract-In this study, a new sequential extraction technique is used to investigate the particulate barium (Ba) phases in sediments from the Arabian Sea to determine the processes controlling Ba accumulation in marine sediments. The total solid-phase Ba concentration in Arabian Sea surface sediments increases with water depth from ϳ200 ppm at 500 meters below sea surface (mbss) to ϳ1000 ppm at 3000 mbss. The sedimentary Ba composition consists of three major fractions: barite, Ba incorporated in aluminosilicates, and Ba associated with Mn/Fe oxides. Accumulation of barite, which is the most important Ba fraction in sediments located below 2000 mbss, increases gradually with water depth. The Ba/Al ratio of the terrigenous fraction varies significantly across the Arabian Basin as the result of differences in grain size and provenance of the terrigenous sediment. Ba associated with Mn oxides is a relatively minor fraction compared with bulk Ba concentrations, and it only accumulates in well-oxygenated sediments below the present-day oxygen minimum zone. The water-depth-dependent accumulation of barite in the Arabian Sea is not related to the continuous formation of barite in settling organic particles or Ba scavenging by Mn oxyhydroxides but is primarily controlled by differences in Ba preservation upon deposition. A good correlation between the barite saturation index and the barite accumulation rate in the upper 2000 m of the water column may indicate that the degree of barite saturation of the bottom water is the main environmental factor regulating the burial efficiency of barite. Organic matter degradation, bioturbation, diagenetic Mn cycling, and the crystallinity of the accumulating barite may play additional roles.

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“…62) space group and lattice constants of a ) 8.8842 Å, b ) 5.4559 Å, c ) 7.1569 Å at 21°C (density F ) 4.474 g/cm 3 ; Figure 1). 38,39 Each Ba 2+ has six nearest-neighbor SO 4 2-'s leading to 12 oxygen atoms in the first nearest-neighbor oxygen shell with distances ranging from 2.765 to 3.315 Å. The Ba-S nearest-neighbor distances are 3.51-3.96 Å.…”

Section: Introductionmentioning

confidence: 99%

“…37 Indeed, it has been proposed that the precipitation kinetics is governed by the dehydration frequency of metal ions and that the dissolution kinetics is governed by solvation affinity for the near-surface divalent metals. 38 For both growth and dissolution, the solvation of surface atoms especially on steps or on kinks is the controlling factor. Thus, inclusion of the solvent in theory is essential for comparing to experiment.…”

Section: Introductionmentioning

confidence: 99%

The MSXX Force Field for the Barium Sulfate−Water Interface

et al. 2002

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A new force field (MSXX FF) was developed for barium sulfate (BaSO 4 ) to reproduce the experimental properties of BaSO 4 crystal (density, lattice energy, compressibility, and vibrational spectrum) and to describe properly the interaction between BaSO 4 and water (binding energies and interatomic distances of Ba(H 2 O) 8 2+ and (SO 4 )(H 2 O) 6 2-clusters determined from ab initio quantum mechanics calculations). Using this FF in combination with F3C FF for water, the surface energies for several surfaces of BaSO 4 were examined both in a vacuum and in the presence of an explicit water bath in contact with them. The same level of FF's are also reported for CaSO 4 and SrSO 4 .

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Crystal chemical controls on the dissolution kinetics of the isostructural sulfates: Celestite, anglesite, and barite

Cited by 124 publications

References 25 publications

Hydration Effects on the Stability of Calcium Carbonate Pre-Nucleation Species

Hydration Effects on the Stability of Calcium Carbonate Pre-Nucleation Species

Barium accumulation in the Arabian Sea: controls on barite preservation in marine sediments

The MSXX Force Field for the Barium Sulfate−Water Interface

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