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• W2189052521 abstract "The dissolution behavior of albite feldspar at temperatures ranging from 100Ð300iC and at pH ranging from 1.4 to 10.3 are presented in the form of a review of the results from HELLMANN (1994, 1995), and HELLMANN et al. (1997). The experiments were run using hydrothermal sow-through systems. The measured dissolution rates, based on Si release, represent Olimiting ratesO since they were measured at conditions far from albite saturation. The dissolution kinetics of albite display a strong dependence on pH, as shown by U-shaped log dissolution rate vs. pH curves at each temperature. The apparent dependence of the rates on pH increases with temperature. The measured activation energies of dissolution are higher at acid and basic pH (89 and 85 kJ mol -1 , respectively) than at neutral pH (69 kJ mol -1 ). The stoichiometry of dissolution at acid pH conditions measured as a function of time shows that both Na and Al are preferentially released with respect to Si, thereby creating Na and Al leached layers. The preferential release of these elements is related to the incorporation of H into these leached layers, as shown both by solution analyses and ion beam-generated depth proÞles of the near surface. Sodium and Al preferential leaching and H enrichment are processes that are pH-dependent; they decrease in magnitude with increasing pH in the acid to neutral pH region. The dissolution behavior of albite is investigated within the context of surface complexation theory. Surface titrations of albite powders at 25iC were carried out in order to determine the surface charge as a function of pH. The H + and OH - adsorption isotherms show that albite surfaces carry increasingly net positive and net negative charge at pH 10, respectively. The pH region from 6Ð10 corresponds to the region of minimum surface charge for albite; the exact pH of surface neutrality (pH ZPC ) is a function of the chemical composition of the titrating suid as well as the speciÞc characteristics of the albite surfaces." @default.
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• W2189052521 date "1999-01-01" @default.
• W2189052521 modified "2023-09-27" @default.
• W2189052521 title "THE DISSOLUTION BEHAVIOR OF ALBITE FELDSPAR AT ELEVATED TEMPERATURES AND PRESSURES: THE ROLE OF SURFACE CHARGE AND SPECIATION" @default.
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