The kinetics of chlorite dissolution

Lowson, Richard T.; Brown, Paul L.; Comarmond, M.-C. Josick; Rajaratnam, G.

doi:10.1016/j.gca.2006.12.008

Cited by 64 publications

(83 citation statements)

References 25 publications

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“…However, not all of the experiments from Lowson et al (2007) were at far-from equilibrium conditions, even though the saturation index log(IAP/K) in their experiments at 95 °C were thought to be in the range -13.5 to -55.0. Although these values would correspond to far-from-equilibrium conditions according to the standard linear form of the transition state theory rate formulation, our results and the …”

Section: Dependence Of Chlorite Dissolution Rate On Phmentioning

confidence: 99%

“…Most previous studies of chlorite dissolution have been conducted at room temperature and pressure, although at various pH values (Banfield and Murakami, 1998;Brandt et al, 2003;Hayashi and Yamada, 1990;Lowson et al, 2007;Lowson et al, 2005;Malmström et al, 1996;Rochelle et al, 1994). Lowson et al (2005) summarized results reported in the literature and concluded that the dissolution of chlorite is enhanced in acidic solutions and alkaline solutions and is independent of pH in the neutral pH region.…”

Section: Previous Studiesmentioning

confidence: 99%

“…(2) The reaction equilibrium constant K eq was not well defined in previous studies, especially for intermediate Mg, Fe chlorite compositions used in the study of Lowson et al (2007). Lowson et al (2007) used the data from Kittrick (1982) who measured the solubility of two chlorites and determined that logK eq =42.3 at 25 °C.…”

Section: Dependence Of Chlorite Dissolution Rate On Phmentioning

confidence: 99%

“…For the purposes of modeling CO 2 injection and sequestration and its effects on geochemistry and mineral evolution, it is critical to provide experimentally verified kinetic rate equations over the full range of relevant conditions. Some studies of chlorite mineral dissolution kinetics have been published (Brandt et al, 2003;Lowson et al, 2007;Malmström et al, 1996;Rochelle et al, 1994;Smith et al, 2013), although none of these have explored the dependence of chlorite dissolution kinetics on the departure from equilibrium (or chemical affinity), despite the demonstrated importance of this effect in natural systems (Maher et al, 2009;Steefel et al, 2005). The dependence of the rate on the chemical affinity becomes particularly important if the transition to the maximum far from equilibrium rate (the socalled "dissolution plateau) is broad, i.e., it does not show a linear dependence on the departure from equilibrium (Maher et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…. Table 2.6 Parameters for calculating kinetic rate constants of minerals (Palandri, (2004) Table 4.4 Thermodynamic calculations of the ΔGr value at 25 o C of the chlorite sample from Lowson et al (2007) using thermodynamic data from Gailhanou et al(2007) …”

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confidence: 99%

See 4 more Smart Citations

Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Zhang

DePaolo

et al. 2013

International Journal of Greenhouse Gas Control

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Section: Dependence Of Chlorite Dissolution Rate On Phmentioning

confidence: 99%

Section: Previous Studiesmentioning

confidence: 99%

Section: Dependence Of Chlorite Dissolution Rate On Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Zhang

DePaolo

et al. 2013

International Journal of Greenhouse Gas Control

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Identification and quantification of redox and pH buffering processes in a heterogeneous, low carbonate aquifer during managed aquifer recharge

Seibert

Atteia

Salmon

et al. 2016

Water Resources Research

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Managed aquifer recharge of aerobic water into deep aquifers often induces the oxidation of pyrite, which can lead to groundwater acidification and metal mobilization. As circumneutral pH is often maintained by the dissolution of sedimentary calcite or high injectant alkalinity little attention is generally paid to potential alternative pH buffering processes. In contrast, this study analyzed water quality evolution from a 2 year long groundwater replenishment trial in an anaerobic, mostly carbonate free aquifer. While injection of aerobic, very low salinity water triggered pyrite oxidation, the comprehensive field data showed that in many aquifer zones pH was buffered without substantial release of inorganic carbon. A numerical analysis was performed to test and evaluate different conceptual models and suggested that either proton buffering or the dissolution of aluminosilicates, or a combination thereof, can explain the observed, rapid buffering at locations where carbonates were absent. In contrast to many previous managed aquifer recharge [MAR) studies, the oxidation of sedimentary pyrite by nitrate was found to be of minor importance or negligible. The study also highlights that the depositional history of the aquifer, and the associated differences in mineralogy and geochemistry, need to be considered when estimating groundwater quality evolution during the injection of various water types for aquifer replenishment or other management purposes. ] describe sequential buffering during ongoing pyrite oxidation in a carbonate-bearing mine waste. After the initial consumption of primary and secondary carbonates (calcite and siderite), they observed the dissolution of previously precipitated gibbsite at pH 4.9-5.2, and subsequent ferrihydrite dissolution at pH < 4.5. Salmon and Malmstr€ om [2004] found that the pH of 4.9 in the groundwater of a carbonate-free mine waste deposit could largely be explained by a balance of acid generation by pyrite oxidation and acid consumption by chlorite and ferrihydrite dissolution.

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Experimental and numerical investigation of CO₂–brine–rock interactions in the early Palaeozoic mudstones from the Polish part of the Baltic Basin at simulatedin situ conditions

et al. 2020

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This study discusses experiment‐induced alterations of shale rocks collected across the ordovician and silurian boundary at a potential site for carbon dioxide sequestration located in the Polish part of the Baltic Basin. Mudstone samples submerged in brine in custom‐built reactors were subjected to CO2 pressures of 30–35 MPa at a temperature of 80°C for 40 days. After the experiments were completed, the mineralogical composition of the studied rocks, their porosity characteristics, and chemistry of brines were analyzed and compared to the original compositions in order to detect experiment‐induced changes. Comparison of mineral composition before and after the experiments demonstrate a set of subtle but systematic mineral changes. The most conspicuous was a presence of Fe in the form of Fe‐oxyhydroxides that was related to the corrosion of the Fe‐bearing steel pipes supplying the experimental setup with CO2. This effect is important from the perspective of industrial carbon dioxide sequestration. However, the second source of Fe ions in experimental brines was related to the decomposition of chlorites, pyrite, and chloritized biotites. The suggested breakdown of pyrite is in line with the modification of the chemical composition of the experimental brines and observed transfer of S ions to the solution. The appearance of Mg and K ions in the experimental brines was related to the decomposition of chlorites and biotites. In turn, observed transfer of Sr cations to the solution could be attributed to the dissolution of biotites and K‐feldspars. The effects of analogue experiments were confronted with the results of geochemical modeling performed using the PHREEQC program. The numerical modeling not only allowed to reproduce all the main mineral and chemical changes postulated on the basis of our analogue experiment, but also enabled to put constraints on the time scale of occurring geochemical processes. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd.

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The kinetics of chlorite dissolution

Cited by 64 publications

References 25 publications

Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Identification and quantification of redox and pH buffering processes in a heterogeneous, low carbonate aquifer during managed aquifer recharge

Experimental and numerical investigation of CO₂–brine–rock interactions in the early Palaeozoic mudstones from the Polish part of the Baltic Basin at simulatedin situ conditions

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The kinetics of chlorite dissolution

Cited by 64 publications

References 25 publications

Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Mineralization of carbon dioxide sequestered in volcanogenic sandstone reservoir rocks

Identification and quantification of redox and pH buffering processes in a heterogeneous, low carbonate aquifer during managed aquifer recharge

Experimental and numerical investigation of CO2–brine–rock interactions in the early Palaeozoic mudstones from the Polish part of the Baltic Basin at simulatedin situ conditions

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Experimental and numerical investigation of CO₂–brine–rock interactions in the early Palaeozoic mudstones from the Polish part of the Baltic Basin at simulatedin situ conditions