Computer Science
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.3505v&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 57, Issue 15, pp.3505-3518
Computer Science
29
Scientific paper
A surface complexation model for the chemical structure and reactivity of the carbonatewater interface is presented. The model postulates the formation of the hydration species >CO 3 H 0 and >MeOH 0 at the surface of a divalent metal carbonate MeCO 3 (Me = Ca, Mn, Fe, etc.). The existence of these primary hydration species is supported by spectroscopic data. The following reactions are proposed to govern surface speciation in the MeCO 3 (s)-H 2 O-CO 2 system: CO 3 H 0 a 2> CO 3 - + H + (1) CO 3 H 0 + Me 2+ a 2> CO 3 Me + + H + (2) MeOH 2 + a 2 > MeOH 0 + H + (3) MeOH 0 a 2 > MeO - + H + (4) MeOH 0 + CO 2 a 2 > MeHCO 3 o (5) MeOH 0 + CO 2 a 2 > MeCO 3 - + H + (6) It is shown in this paper that the surface complexation model provides a systematic explanation of surface charge development and dissolution kinetics of carbonate minerals. The intrinsic stability constants of the surface complexation reactions agree well with the equilibrium constants of the corresponding complexation reactions in homogeneous solution.
Charlet Laurent
Stumm Werner
Van Cappellen Philippe
Wersin Paul
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