Stable-isotope probe of nano-scale mineral-fluid redox interactions

Kavner, Abby¹ 

[1] Univ. of California, Los Angeles, CA (United States)

关键词: Stable isotope fractionation;    electrochemistry;    electrodeposition;    metal-aqueous interfaces;   

DOI  :  10.2172/1164612
RP-ID  :  DOE-UCLA--03799
PID  :  OSTI ID: 1164612

美国|英语

来源: SciTech Connect

【 摘 要 】

The project examined how stable isotopes fractionate at an aqueous/solid interface during electrochemical reduction reactions. Measurements in a wide variety of metal deposition systems including Fe, Zn, Li, Mo, and Cu, have led to observations of large isotope fractionations which strongly vary as a function of rate and temperature. For the Fe, Zn, and Li systems, our electrochemical deposition methods provide the largest single-pass fractionation factors that are observed for these systems. Based on these and other experiments and theory showing and predicting significant and rate-dependent fractionations of isotopes at reacting interfaces, we have developed a simple statistical mechanics framework that predicts the kinetic isotope effect accompanying phase transformations in condensed systems. In addition, we have begun to extend our studies of mineral-fluid redox interactions to high pressures and temperatures in the diamond anvil cell. We performed a series of experiments to determine solubilities of Cu and Ni at elevated pressure and temperature conditions relevant to ore-formation.