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• W2060776319 startingPage "2165" @default.
• W2060776319 abstract "We used a reproducible seeded growth technique with a pH-stat to study the kinetics of calcite precipitation at 25°C. We performed different experiments at initial Ca2+ and HCO3− concentrations ranging from 0.7–2 and 4–7 mmol L−1, pH values ranging from 8.25 to 8.70, pCO2 values ranging from 0.0006 to 0.01 atm, and ionic strengths ranging from 0.015 to 0.10 mol L−1. With this experimental data set, we used initial rate measurements and integral methods to test several precipitation rate equations. Rate equations that possess a disequilibrium functional dependence, such as the BURTON et al. (1951) dislocation model, forms of the Davies and Jones (1955) model, and the model used by Reddy and Nancollas (1973), did not adequately describe the kinetics of calcite precipitation at pH greater than 8 and pCO2 less than 0.01 atm. Rate equations that describe independent dissolution and precipitation mechanisms with elementary reactions, such as the equation presented by Plummeret al. (1978), and nancollas and Reddy (1971) were more successful. However, Plummer's model did not adequately describe the rate of all experiments due to the presence of an OH− surface term in the precipitation rate equation. The elementary reaction of the Nancollas and Reddy model is written in terms of bulk Ca2+ and CO3− concentrations, and appears to be the most successful model which describes calcite precipitation at pH > 8 and pCO2 < 0.01 atm. The Nancollas and Reddy model, altered to account for varying ionic strengths, adequately described the rate of all experiments and yielded a precipitation rate constant of 118.2 ± 13.9 dm6 mol−1 m−2 s−1, with an apparent Arrhenius activation energy of 48.1 kJ mol−1." @default.
• W2060776319 created "2016-06-24" @default.
• W2060776319 creator A5007622690 @default.
• W2060776319 creator A5079964792 @default.
• W2060776319 date "1985-10-01" @default.
• W2060776319 modified "2023-10-11" @default.
• W2060776319 title "An evaluation of rate equations for calcite precipitation kinetics at less than 0.01 atm and pH greater than 8" @default.
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• W2060776319 doi "https://doi.org/10.1016/0016-7037(85)90074-2" @default.
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