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Showing 1 to 13 of 13 for “"Calcite dissolution"”.
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Modelling calcite dissolution in a rotating disc reaction vessel
… in many natural and industrial processes. For calcite dissolution, the kinetics and mass transport of the dissolved species reflect both the chemistry of the bulk, and the conditions at the dissolving interface. We formulate the dissolution problem as a set of coupled convection- …
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The Influence of Equilibrium Reactions on the Kinetics of Calcite Dissolution in Lactic Acid Solutions
… of the reaction between lactic acid and calcite will allow for optimized treatment design. The kinetic model was also used to isolate the contributions of the transport of reactants, the surface reaction, and the transport of products to the overall resistance of the reaction. At all …
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Field Test of a Calcite Dissolution Rate Law: Fort’s Funnel Cave, Mammoth Cave National Park
<p>The laboratory-derived calcite dissolution rate law of Plummer et al. (1978) is the most widely used and mechanistically detailed expression currently available for predicting dissolution rates as a function of water chemistry. Such rate expressions are of great use in understanding timescales …
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Controls on Heavy Metal Mobility at the Pecos Mine Operable Unit, New Mexico
… unmined regions. Models that account for both calcite dissolution and mixing of up to three kilograms background water per kilogram of mine drainage water ratio reproduce the observed decrease in aqueous metal concentrations with increasing pH. Contaminant concentrations attenuate via three …
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Isotopic composition of dissolved inorganic carbon in underground mine discharges of the northern appalachian basin
… sites. Hydrogeochemical results show evidence of calcite dissolution, biogenic sulfate reduction, and CO2 evasion in the sample set. However, no definitive correlation was observed between isotopic and geochemical results that would be useful for differentiating sources of dissolved inorganic …
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Depositional and paragenetic controls on porosity development, upper Red River Formation, North Dakota
… due to syndepositional dolomitization and later calcite solution and microfracturing. Maximum porosity values related to dolomitization and calcite dissolution occur in the burrowed horizons immediately above the impermeable organic units, which acted as barriers to interstitial fluid movement. …
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Analysis of coal combustion by-product disposal practices in an arid climate : leachate water quality
… Mineralogical examination found evidence of dissolution of some mineral phases on buried CCBs. Older ash samples showed evidence of secondary mineralization leading to formation of calcite. Dissolution of aluminosilicate minerals was found in unsaturated column leach tests as increasing …
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Effects of liming on plankton and young-of-the-year bluegill growth in Flat Top Lake, West Virginia
… Lake was treated with 28.8 dry metric tonnes of calcite using slurry box technology between July 13-20, 1987. The design was confounded because calcite dissolution products diffused into the unlimed (west) arm after the treatment which made total alkalinity similar between the arms within 1 …
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A central Texas drying event identified at the Younger Dryas-early Holocene transition using coupled speleothem 𝛿¹³C-¹⁴C analysis
… and measured ²³⁰Th/²³²Th ratios from modern calcite grown in central Texas caves to estimate the McN-1 initial ²³⁰Th/²³²Th ratio and develop an age model with better constrained uncertainties. Strong correlations between speleothem 𝛿¹³C and ¹⁴C activities can result from changes in epikarst …
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Deposition and diagenesis of a portion of the Frobisher-Alida Interval (Mississippian Madison Group), Wiley Field, North Dakota
… hypersaline brines include dolomitization and calcite dissolution. Basinward-flowing, magnesium-rich brines derived from gypsum precipitating areas formed dolomite in a near surface, sublittoral setting. The same brines carried sulfide ions basinward where they were oxidized, creating an acid …
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A modular atomic force microscope for nanotechnology research
… on deposition and stripping is observed. Second, calcite dissolution in low-pH environments is imaged. Dissolution processes in sulfuric and hydrochloric acid solutions are compared. It is apparent that the rhombohedral crystalline structure of the calcite clearly influences the dissolution …
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Effect of Coatings on Mineral Reaction Rates in Acid Mine Drainage
This dissertation includes theoretical and applied components that address the effect of coatings on rates of mineral reactions that occur in acid mine drainage (AMD) environments. The two major projects investigated how diffusion-limited transport of reactants through pore spaces in coatings on …
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Effect of CO2 injection on the poromechanical and multiphase flow characteristics of subsurface rock
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01