Calcite dissolution kinetics

Sjoberg, E.L. Rickard, D.T. 1984. Calcite dissolution kinetics surface speciation and the origin of the variable pH dependence, Chemical Geology, 42, 119-136. 

Sjoberg E. L. (1976). A fundamental equation for calcite dissolution kinetics. Geochim. Cosmochim. Acta, 40 441-447. 

Baumann J., Buhmann D., Dreybrodt W. and Schultz H.D. (1985) Calcite dissolution kinetics in porous media. Chem. Geolog. 53, 219-228. 

Buhmann D. and Dreybrodt W. (1987) Calcite dissolution kinetics in the system H20-C02-CaC03 with participation of foreign ions. Chem. Geol. 64, 89-102. 

Sjoberg, E.L. A fundamental equation for calcite dissolution kinetics. Geochim. Cosmochim. Acta 40, 441-447 (1976). Weiss, R.F. Carbon dioxide in water and sea water the solubility of a non-ideal gas. Mar. Chem. 2, 203-215 (1974). Lyman, J. Buffer mechanism of sea water. Ph. D. Thesis,... 

Approximating the role of calcite dissolution kinetics in determining the width of the CaCOs transition from 90% to 10% in marine sediments... 

In contrast, the study of calcite dissolution kinetics in CaCOj-poor sedi-ments of the equatorial Atlantic, Adler et al. (2001) again favored higher reaction orders. In this sense, the observed dissolution rate constants are highly variable, which seems to be mainly dependent on differences in the physical (e.g. surface area) and chemical properties (high/low Mg-calcite) of the calcite mineral phase. 

Berner, R.A. Morse, J.M. 1974. Dissolution kinetics of calcium carbonate in seawater. IV. Theory of calcite dissolution, American Journal of Science, 274,108-134. 

Schott,). Brantley, S. Crerar, D. Guy, Ch. Bor-sik, M. Willaime, Ch. (1989) Dissolution kinetics of strained calcite. Geochim. Cosmochim. Acta 53 373-382 Schrader, R. Biittner, G. (1963) New iron oxide phase -Fe20j Z. anorg. Allg. Chemie 320 220-234... 

Recently, Chou et al. (1989) studied the dissolution kinetics of various carbonate minerals in aqueous solution. Figure 2.10 illustrates the experimental results for aragonite, calcite, witherite, dolomite, and magnesite. These data can be fit by rate equations, an example of which is shown in equation 2.28 for calcite. 

Phosphate has been found to be an extremely strong inhibitor of carbonate reaction kinetics, even at micromolar concentrations. This constituent has been of considerable interest in seawater because of its variability in concentration. It has been observed that phosphate changes the critical undersaturation necessary for the onset of rapid calcite dissolution (e.g., Berner and Morse, 1974), and alters the empirical reaction order by approximately a factor of 6 in going from 0 to 10 mM orthophosphate solutions. Less influence was found on the log of the rate constant. Walter and Burton (1986) observed a smaller influence of phosphate on calcite... 

Morse J.W. (1973) The dissolution kinetics of calcite A kinetic origin for the lysocline. Ph.D. dissertation, Yale Univ. 

Plummer L.N., Parkhurst D.L. and Wigley T.M.L. (1979) Critical review of the kinetics of calcite dissolution and precipitation. In Chemical Modelling--Speciation, Sorption, Solubility and Kinetics in Aqueous Systems (ed. E. Jenne), pp. 537-573. American Chemical Society, Washington, D.C. 

Sjoberg E.L. (1978) Kinetics and mechanism of calcite dissolution in aqueous solutions at low temperatures. Acta Univ. Stockholmiensis, Stockholm Contr. Geology 332, 1-92. 

Walter L.M. and Hanor J.S. (1979) Effect of orthophosphate on the dissolution kinetics of biogenic magnesian calcites. Geochim. Cosmochim. Acta 43, 1377-1385. 

Sjoberg, E. L., "Kinetics and Mechanism of Calcite Dissolution in Aqueous Solutions at Low Temperatures," Stockholm Contributions in Geology, 32(1), 1981. 

Model the carbonate precipitation in this carbonate channel by means of a Id transport with 40 cells of 10 m length each. Dispersivity is assumed with lm. Use the key words KINETICS and RATES and the BASIC program for calcite from the data set PHREEQC.dat describing the kinetics for both the calcite dissolution and the calcite precipitation. How much calcite precipitates each year within the channel s first 400 meter after the discharge How much C02 degasses at the same time ... 

---