Open AccessTransport and reaction kinetics at the glass:solution interface region: Results of repository-oriented leaching experiments
Author(s) -
T.A. Abrajano,
J. K. Bates
Publication year - 1986
Language(s) - English
Resource type - Reports
DOI - 10.2172/59992
Subject(s) - leaching (pedology) , precipitation , radioactive waste , borosilicate glass , kinetics , leachate , mineralogy , chemistry , analytical chemistry (journal) , diffusion , materials science , chemical engineering , nuclear chemistry , thermodynamics , metallurgy , geology , environmental chemistry , soil science , physics , quantum mechanics , meteorology , engineering , soil water
Repository-oriented leaching experiments involving Savannah River Laboratory (SRL) 165 type glass under a {gamma}-radiation field (1 = 0.2 x 10{sup 4} R/h) have been performed by the Nevada Nuclear Waste Storage Investigations (NNWSI) project. In this communication, we discuss glass surface analyses obtained by SEM, nuclear resonance profiling, and SIMS together with leachate solution data in relation to a mechanism that couples diffusion, hydrolysis (etching and gelation), and precipitation to qualitatively describe the release of different glass components to the leachant solutions. The release of mobile (e.g., Li) and partly mobile (e.g., B) species is controlled primarily by interdiffusion with water species across the interdiffusion zone. Glass components that are immobile in the interdiffusion zone are released to the solution by etching. For prediction of long-term steady-state concentrations of glass components with low solubility, the relative rates of release from the glass and secondary mineral precipitation must be taken into account