ESTIMATION OF SURFACE PRECIPITATION CONSTANTS FOR SORPTION OF DIVALENT METALS ONTO HYDROUS FERRIC OXIDE AND CALCITE
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dc.contributor.author | Zhu C. | |
dc.date.accessioned | 2021-04-19T23:58:29Z | |
dc.date.available | 2021-04-19T23:58:29Z | |
dc.date.issued | 2002 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=1106273 | |
dc.identifier.citation | Chemical Geology, 2002, 188, 1-2, 23-32 | |
dc.identifier.issn | 0009-2541 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28095 | |
dc.description.abstract | Equilibrium constants for modeling surface precipitation of divalent metals, M2+, onto hydrous ferric oxide and calcite were estimated from linear correlations of standard state Gibbs free energy of formation, ΔGf°, of the surface precipitates. The experimental ΔGf° of the surface precipitates was derived from the surface precipitation model of Farley et al. [J. Colloid Interface Sci. 106 (1985) 226], which in turn was based on a surface complexation model coupled with solid solution representation for precipitation on the surface. The ΔGf° values are correlated through the relationsΔGf,M(OH)2(s)°-77.210rM2+=1.03266ΔGn,M2+°-30 5.368andΔGf,MCO3(s)°-83.991rM2+=0.915ΔGn,M2+°-343.331wh ere 's' stands for the end-member component of the solid solution, ΔGf° is in kcal/mol, r represents the Shannon-Prewitt radius of M2+ in a given coordination state (Α), and ΔGn, M2+° denotes the non-solvation contribution to the Gibbs free energy of formation of the aqueous M2+ ion. The coefficients in the correlations were regressed from the aforementioned experimental ΔGf°. The statistically significant correlations (R2=0.99) allow approximate estimation of free energies and, hence, equilibrium constants of the surface precipitation reactions for Be2+, Mg2+, Ca2+, Mn2+, Co2+, Ni2+, Sr2+, Sn2+, Ba2+, Eu2+, Ra2+, Pb2+, Hg2+, Cu2+, and UO22+. | |
dc.subject | SURFACE ADSORPTION | |
dc.subject | IRON OXIDE | |
dc.subject | CALCITE | |
dc.subject | PRECIPITATION | |
dc.title | ESTIMATION OF SURFACE PRECIPITATION CONSTANTS FOR SORPTION OF DIVALENT METALS ONTO HYDROUS FERRIC OXIDE AND CALCITE | |
dc.type | Статья |
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