Experimental determination of the effect of dissolved CO2 on the dissolution kinetics of Mg and Ca silicates at 25 °C

Голубев, С. В.; Pokrovsky, Oleg S.; Schott, Jacques

doi:10.1016/j.chemgeo.2004.12.011

Cited by 178 publications

(127 citation statements)

References 24 publications

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“…However, the predictive ability of studies like these will always be limited by irreducible uncertainty in field-scale mineral dissolution kinetic rates and local-scale heterogeneity in aquifer mineralogy. Mechanistic-based approaches to measuring kinetics are only possible in the laboratory under well-controlled conditions (Bose and Sharma 2002;Bruno et al 1992;Craw et al 2003;Golubev et al 2005;Stephens and Hering 2004). Unfortunately, large discrepancies between field and laboratory rate estimates (Chen 2005;Langmuir 1997) contributes to uncertainty in predictive modeling.…”

Section: Introductionmentioning

confidence: 99%

The impact of CO2 on shallow groundwater chemistry: observations at a natural analog site and implications for carbon sequestration

et al. 2009

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In a natural analog study of risks associated with carbon sequestration, impacts of CO 2 on shallow groundwater quality have been measured in a sandstone aquifer in New Mexico, USA. Despite relatively high levels of dissolved CO 2 , originating from depth and producing geysering at one well, pH depression and consequent trace element mobility are relatively minor effects due to the buffering capacity of the aquifer. However, local contamination due to influx of brackish waters in a subset of wells is significant. Geochemical modeling of major ion concentrations suggests that high alkalinity and carbonate mineral dissolution buffers pH changes due to CO 2 influx. Analysis of trends in dissolved trace elements, chloride, and CO 2 reveal no evidence of in situ trace element mobilization. There is clear evidence, however, that As, U, and Pb are locally co-transported into the aquifer with CO 2 -rich brackish water. This study illustrates the role that local geochemical conditions will play in determining the effectiveness of monitoring strategies for CO 2 leakage. For example, if buffering is significant, pH monitoring may not effectively detect CO 2 leakage. This study also highlights potential complications that CO 2 carrier fluids, such as brackish waters, pose in monitoring impacts of geologic sequestration.

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Section: Introductionmentioning

confidence: 99%

The impact of CO2 on shallow groundwater chemistry: observations at a natural analog site and implications for carbon sequestration

et al. 2009

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“…Therefore, to obtain substantial CO 2 sequestration by the mineral carbonation process, the problem of slow release of divalent cations from alkaline silicate minerals should be overcome. This is why many studies have been devoted to understand the dissolution mechanism of silicate minerals in order to find out the best environmental conditions to obtain higher dissolution rates (Golubev et al, 2005;Murphy & Helgeson, 1987;Schott et al, 2012;Weissbart & Rimstidt, 2000;Wogelius & Walther, 1991). Various options have been proposed with the aim of improving the dissolution kinetics of silicate minerals.…”

Section: Mineral Co 2 Sequestrationmentioning

confidence: 99%

“…In addition, direct bacterial effects such as biofilm growth can also potentially improve the dissolution process (Castanier et al, 1999;Pokrovsky et al, 2009;Salek et al, 2013c). While the effect of pCO 2 and ionic strength on silicate dissolution rate is well characterized, particularly for Mg and Fe silicates such as olivine (Golubev et al, 2005;Rimstidt & Dove, 1986), the effects of organic ligands on Ca silicates such as wollastonite have been hardly studied and the studies performed were at neutral and weakly alkaline pH (Pokrovsky et al, 2009). The organic ligands are known to enhance the dissolution rate by two key mechanisms: adsorption of ligands to >CaOH 2 + and >CaOH° sites on the mineral surface and complexation with the free Ca ion in the aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Mineral CO2 sequestration by environmental biotechnological processes

Salek

Kleerebezem

Jonkers

et al. 2013

Trends in Biotechnology

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“…The effect of CO 2 on the dissolution rate was not included as it is negligible for partial pressures up to 1 bar (Golubev et al 2005). The coefficients Lim, x i and z i were determined for a limited numbers of minerals by Sverdrup and Warfvinge (1995) and Sverdrup (1990), and were adopted in this work.…”

Section: Silicate Mineral Dissolutionmentioning

confidence: 99%

“…3 shows the results of the fit for the mineral diopside. Two datasets were used (Golubev et al 2005;Knauss et al 1993) to determine the kinetic parameters. Fitting of the parameters was done for each dataset.…”

Section: Determination Of Kinetic and Thermodynamic Parametersmentioning

confidence: 99%

Evaluation of Silicate Minerals for pH Control During Bioremediation: Application to Chlorinated Solvents

Lacroix

Brovelli

Holliger

et al. 2012

Water Air Soil Pollut

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Accurate control of groundwater pH is of critical importance for in situ biological treatment of chlorinated solvents. This study evaluated a novel approach for buffering subsurface pH that relies on the use of silicate minerals as a long-term source of alkalinity. A screening methodology based on thermodynamic considerations and numerical simulations was developed to rank silicate minerals according to their buffering efficiency. A geochemical model including the main microbial processes driving groundwater acidification and silicate mineral dissolution was developed. Kinetic and thermodynamic data for silicate minerals dissolution were compiled. Results indicated that eight minerals (nepheline, fayalite, glaucophane, lizardite, grossular, almandine, cordierite and andradite) could potentially be used as buffering agents for the case considered. A sensitivity analysis was conducted to identify the dominant model parameters and processes. This showed that accurate characterization of mineral kinetic rate constants and solubility are crucial for reliable prediction of the acid-neutralizing capacity. In addition, the model can be used as a design tool to estimate the amount of mineral (total mass and specific surface area) required in field applications.

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Experimental determination of the effect of dissolved CO2 on the dissolution kinetics of Mg and Ca silicates at 25 °C

Cited by 178 publications

References 24 publications

The impact of CO2 on shallow groundwater chemistry: observations at a natural analog site and implications for carbon sequestration

The impact of CO2 on shallow groundwater chemistry: observations at a natural analog site and implications for carbon sequestration

Mineral CO2 sequestration by environmental biotechnological processes

Evaluation of Silicate Minerals for pH Control During Bioremediation: Application to Chlorinated Solvents

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