Metal release from dolomites at high partial-pressures of CO2

Wunsch, Assaf; Navarre‐Sitchler, Alexis; Moore, Jeffrey D.; Ricko, Allison N.; McCray, John E.

doi:10.1016/j.apgeochem.2013.08.005

Cited by 38 publications

(29 citation statements)

References 58 publications

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“…Interaction with CO 2 rich fluids may also induce mineral dissolution, porosity-permeability changes, metal ion release (e.g. Fe, Cr, Ni, Sr, Ba, Zn), and subsequent mineral precipitation Wunsch et al, 2013). Injecting CO 2 containing SO 2 , O 2 and NO 2 has been predicted or observed to result in the formation of acids stronger than carbonic acid, e.g.…”

Section: Introductionmentioning

confidence: 98%

SO2–CO2 and pure CO2 reactivity of ferroan carbonates at carbon storage conditions

et al. 2015

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Section: Introductionmentioning

confidence: 98%

SO2–CO2 and pure CO2 reactivity of ferroan carbonates at carbon storage conditions

et al. 2015

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“…Processes controlling metal release into pore waters at elevated CO 2 concentrations include mineral dissolution and desorption of cations from mineral surfaces (Ardelan and Steinnes, 2010;Kirsch et al, 2014;Wunsch et al, 2014Wunsch et al, , 2013. During the QICS experiment, concentrations of a number of metals, including Ca, Fe and Mn, and the metalloid Si, increased in the Table 6 Concentrations of metals in sediments collected from Zone 1 on D13/D14, D42/D43 and D53/D54.…”

Section: Zone 1 Averagementioning

confidence: 98%

“…Some of these metals may be present as impurities in carbonates and are released into solution when carbonate dissolves (Kirsch et al, 2014;Wunsch et al, 2013); additionally, some of these metals co-precipitate with Fe-Mn oxyhydroxides and sulphides, or are present in silicate minerals, all of which can be dissolved in the presence of high CO 2 (Mickler et al, 2013).…”

Section: As (Ppm)mentioning

confidence: 99%

“…Bednarsek et al, 2012;Fabricius et al, 2011;Krause et al, 2012;Murray et al, 2013;Riebesell et al, 2007). In addition, rates of some natural mineral weathering reactions increase at low pH (Ganor et al, 1995), and dissolution and/or desorption of metals from minerals may be enhanced (Payán et al, 2012;Wunsch et al, 2014Wunsch et al, , 2013. These mobilised metals may accumulate in marine organisms (López et al, 2010), can inhibit growth or even have lethal effects (Riba et al, 2003;Basallote et al, 2014).…”

Section: Introductionmentioning

confidence: 95%

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Effect of a controlled sub-seabed release of CO 2 on the biogeochemistry of shallow marine sediments, their pore waters, and the overlying water column

Lichtschlag

James

Ståhl

et al. 2015

International Journal of Greenhouse Gas Control

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Please cite this article in press as: Lichtschlag, A., et al., Effect of a controlled sub-seabed release of CO 2 on the biogeochemistry of shallow marine sediments, their pore waters, and the overlying water column. Int. J. Greenhouse Gas Control (2014), http://dx.Article history: Available online xxx Keywords: Carbon capture and storage CO2 leakage Sediment biogeochemistry Release of metals Environmental impact a b s t r a c tThe potential for leakage of CO 2 from a storage reservoir into the overlying marine sediments and into the water column and the impacts on benthic ecosystems are major challenges associated with carbon capture and storage (CCS) in subseafloor reservoirs. We have conducted a field-scale controlled CO 2 release experiment in shallow, unconsolidated marine sediments, and documented the changes to the chemical composition of the sediments, their pore waters and overlying water column before, during and up to 1 year after the 37-day long CO 2 release. Increased levels of dissolved inorganic carbon (DIC) were detected in the pore waters close to the sediment-seawater interface in sediments sampled closest to the subsurface injection point within 5 weeks of the start of the CO 2 release. Highest DIC concentrations (28.8 mmol L −1 , compared to background levels of 2.4 mmol L −1 ) were observed 6 days after the injection had stopped. The high DIC pore waters have high total alkalinity, and low ı 13 C DIC values (−20‰, compared to a background value of −2‰), due to the dissolution of the injected CO 2 (ı 13 C = −26.6‰). The high DIC pore waters have enhanced concentrations of metals (including Ca, Fe, Mn) and dissolved silicon, relative to non-DIC enriched pore waters, indicating that dissolution of injected CO 2 promotes dissolution of carbonate and silicate minerals. However, in this experiment, the pore water metal concentrations did not exceed levels considered to be harmful to the environment. The spatial extent of the impact of the injected CO 2 in the sediments and pore waters was restricted to an area within 25 m of the injection point, and no impact was observed in the overlying water column. Concentrations of all pore water constituents returned to background values within 18 days after the CO 2 injection was stopped.

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“…Among these factors, temperatures play an important role: For the rock-H 2 O-CO 2 system at different temperatures of 55°C, 70°C and 100°C, the corrosion of feldspars, silica and clay minerals intensifies with increasing temperature [19]. For CO 2 in these systems, aqueous concentration of metal ions increased with increasing in carbonate cements [20,21]. …”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Simulation of Carbonate Cements-Water-Carbon Dioxide Equilibrium in Sandstone for Prediction of Precipitation/Dissolution of Carbonate Cements

et al. 2016

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Carbonate cements, such as calcite, dolomite, ferrocalcite and ankerite, play important roles in the formation of pores in sandstones: precipitation of carbonate cements modifies pores and inhibits compaction, while dissolution creates secondary pores. This work proposed a precipitation-dissolution model for carbonate cements-CO2-H2O system by means of ion equilibrium concentration ([M2+], M = Ca, Mg, Fe or Mn) with different factors, such as temperature, depth, pH, , variable rock composition and overpressure. Precipitation-dissolution reaction routes were also analyzed by minimization of the total Gibbs free energy (ΔG). Δ[M2+], the variation of [Ca2+], [Fe2+], [Mg2+] or [Mn2+] for every 100 m of burial depths, is used to predict precipitation or dissolution. The calculation results indicate that the increasing temperature results in decrease of equilibrium constant of reactions, while the increasing pressure results in a relatively smaller increase of equilibrium constant; As a result, with increasing burial depth, which brings about increase of both temperature and pressure, carbonate cements dissolve firstly and produces the maximal dissolved amounts, and then precipitation happens with further increasing depth; For example, calcite is dissolving from 0.0 km to 3.0 km with a maximal value of [Ca2+] at depth of 0.8 km, and then precipitates with depth deeper than 3.0 km. Meanwhile, with an increasing CO2 mole fraction in the gaseous phase from 0.1% to 10.0% in carbonate systems, the aqueous concentration of metal ions increases, e.g., dissolved amount of CaFe0.7Mg0.3(CO3)2 increases and reaches maximum of 1.78 mmol·L-1 and 8.26 mmol·L-1 at burial depth of 0.7 km with CO2 mole fraction of 0.1% and 10.0%, respectively. For the influence of overpressure in the calcite system, with overpressure ranging from 36 MPa to 83 MPa, pH reaches a minimum of 6.8 at overpressure of 51 MPa; meanwhile, Δ[Ca2+] increases slightly from -2.24 mmol·L-1 to -2.17 mmol·L-1 and remains negative, indicating it is also a precipitation process at burial depth of 3.9 km where overpressure generated. The method used in this study can be applied in assessing burial precipitation-dissolution processes and predicting possible pores in reservoirs with carbonate cement-water-carbon dioxide.

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Metal release from dolomites at high partial-pressures of CO2

Cited by 38 publications

References 58 publications

SO2–CO2 and pure CO2 reactivity of ferroan carbonates at carbon storage conditions

SO2–CO2 and pure CO2 reactivity of ferroan carbonates at carbon storage conditions

Effect of a controlled sub-seabed release of CO 2 on the biogeochemistry of shallow marine sediments, their pore waters, and the overlying water column

Thermodynamic Simulation of Carbonate Cements-Water-Carbon Dioxide Equilibrium in Sandstone for Prediction of Precipitation/Dissolution of Carbonate Cements

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