Experimental study of the effect of pH and temperature on the kinetics of montmorillonite dissolution

Rozalén, Marisa; Huertas, F. Javier; Brady, P. R.

doi:10.1016/j.gca.2009.03.026

Cited by 83 publications

(44 citation statements)

References 26 publications

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“…The regression equations for BB clay (present study), kaolinite (Khawmee et al, 2013), illite (Bibi et al, 2011a), and smectite (Bibi et al, 2011b) pH 4 the steady state Al/Si ratios were close to the original clay at higher ionic strength, but significantly smaller Al/Si ratio compared to the original clay was observed at lower ionic strength; this trend was observed at all temperatures investigated. Similar results were reported in an earlier study conducted on montmorillonite dissolution in highly acidic solutions (pH 1-3) (Rozalen et al, 2009b). However, in slightly acidic to near neutral solutions (pH 4-6), a decrease in the Al/Si ratio was reported, which was attributed to possible adsorption of dissolved Al on the mineral surface or the precipitation of Al minerals (Rozalen et al, 2009b).…”

Section: Stoichiometry Of Clay Dissolution At Steady Statesupporting

confidence: 88%

“…By contrast, Metz et al (2005a) investigated the dissolution of smectite and suggested that the initial higher concentration of Si compared to Al was due to the fast dissolution of amorphous silica particles, which were present as an impurity in the mineral sample. Rozalen et al (2009b) also observed high initial Si and low Al concentrations from acidic dissolution of montmorillonite and attributed this to the presence of impurities. Given that the initial Si concentrations in the present study were virtually independent of the ionic strength at each pH condition, we conclude that the preferential release of Si over Al at low ionic strength is more likely due to inhibited Al release rather than enhanced Si release from impurity phases or quartz.…”

Section: Initial Release Of Si Al K Fe and Mgmentioning

confidence: 88%

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Dissolution kinetics of soil clays in sulfuric acid solutions: Ionic strength and temperature effects

Bibi

Singh

Silvester

2014

Applied Geochemistry

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Section: Stoichiometry Of Clay Dissolution At Steady Statesupporting

confidence: 88%

Section: Initial Release Of Si Al K Fe and Mgmentioning

confidence: 88%

Dissolution kinetics of soil clays in sulfuric acid solutions: Ionic strength and temperature effects

Bibi

Singh

Silvester

2014

Applied Geochemistry

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“…Most minerals show a dissolution minimum in the pH range 4-6, close to the point of zero charge. The individual dissolution curves at various temperatures tend to be close in this minimum pH range, while become more widely separated at more acid and basic pH as temperature increases (Rozalen et al 2009). The increase in the temperature may also have a positive effect on the anion exchange rates of arsenate with hydroxyl.…”

Section: Discussionmentioning

confidence: 92%

Release of Arsenic from Volcanic Rocks through Interactions with Inorganic Anions and Organic Ligands

2010

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The effects of a number of inorganic anions (F -, HCO 3 -, B(OH) 4 -, Cl -, I -) and of the siderophore DFO-B on the release of As from volcanic rocks were investigated in batch experiments. While previously reported field and laboratory data support a role of inorganic anions on As mobilization into aquifers, the role of siderophores on As-induced mobilization was less investigated. Fluoride, bicarbonate and DFO-B have shown a significant influence on the release of As from the rocks. Lava was mostly affected among the investigated rocks at pH 6 and 20°C by releasing 4% of its initial As content in the presence of 0.01 M F -and 10% in the presence of 500 lM DFO-B. The effect of fluoride was larger at pH 6 than at pH 8.5 for all the rocks. In the case of DFO-B, there was also a larger effect at pH 6 compared to pH 8 for the various rocks except tuff. Bicarbonate played a role under alkaline conditions while its effect was negligible at pH 6. Anion exchange processes in the presence of fluoride and bicarbonate and complexation processes in the presence of the siderophore DFO-B appear to be the major processes responsible for the release of arsenic from the rocks. The siderophore DFO-B plays mainly an indirect role on the As release by complexing Al, Fe and Mn, thus favoring the dissolution of the rocks and the consequent release of As bound to surface Al, Fe and Mn oxy-hydroxides. These findings suggest that ionic interactions with fluoride, bicarbonate and siderophore may be a further triggering factor in the mobilization of As from aquifer rocks.

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“…The primary sample contained 41.49% quartz ( Table 2). The process of removing impurities (quartz) requires joining other solvents or specific gravity liquid and then washing with deionized water, which may reduce the dissolution rate of the sample (Zysset and Schindler, 1996;Rozalen et al, 2009). Therefore, we did not remove quartz from the sample.…”

Section: Samplesmentioning

confidence: 99%

Dissolution of Illite in Supercritical CO<sub>2</sub>–Saturated Water: Implications for Clayey Caprock Stability in CO<sub>2</sub> Geological Storage

Sang

Wang

et al. 2018

J. Chem. Eng. Japan / JCEJ

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A series of experimental simulations were conducted to study the e ects of supercritical CO 2 -water on the dissolution of illite under di erent burial depth conditions (1,000, 1,500, and 2,000 m). In addition, the mineral composition, crystalline structure, and uid composition were analyzed. The results indicate that illite dissolution is controlled by solid-liquid diffusion and surface chemical reactions. The elements that undergo metathesis are more easily released than the original xed elements in the crystal lattice, and the interlayer cations are released more easily than octahedral and tetrahedral ions. At deeper burial depths, the percentages of dissolved ions increase. After the reaction, the crystallinity of illite decreases, the proportion of amorphous material increases, and the morphology changes with damage to the lattice. Meanwhile, the dissolution of illite can contribute to the generation of diaspore and siderite.

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Experimental study of the effect of pH and temperature on the kinetics of montmorillonite dissolution

Cited by 83 publications

References 26 publications

Dissolution kinetics of soil clays in sulfuric acid solutions: Ionic strength and temperature effects

Dissolution kinetics of soil clays in sulfuric acid solutions: Ionic strength and temperature effects

Release of Arsenic from Volcanic Rocks through Interactions with Inorganic Anions and Organic Ligands

Dissolution of Illite in Supercritical CO<sub>2</sub>–Saturated Water: Implications for Clayey Caprock Stability in CO<sub>2</sub> Geological Storage

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