Origins of Deviations from Transition-State Theory: Formulating a New Kinetic Rate Law for Dissolution of Silicates.

Luttge, A. ; Icenhower, J. P.

Technical Information Center Oak Ridge Tennessee

关键词: Silicates;    Dissolution;    Kinetics;    Reaction rate;    Reactivity;   

RP-ID  :  DE2006861899

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Present models for dissolution of silicate minerals and glasses, based on Transition-State Theory (TST), overestimate the reaction rate as solution compositions approach saturation with respect to the rate-governing solid. Therefore, the reactivity of key materials in the environment, such as feldspar, mica, and borosilicate glass, is uncertain and any prediction of future aqueous susceptibility to dissolution is suspect. The core objective of this investigation was to determine the origin of these discrepancies and to fashion a quantitative model that reliably predicts the reactivity of silicate materials in realistic environmental conditions. This was accomplished using newly developed experimental techniques. Results of these experiments were verified against computer simulations based upon first-principle theory.