An isotope effect was observed in pH-stat experiments when comparing the leaching rates of sodium from sodium trisilicate glass in deuterated and protonated water. The magnitude of the effect, defined as the ratio of leaching rates in D//2O to those in H//2O, was 0. 70 plus or minus 0. 07. The isotope effect persisted at this magnitude both in the initial stages of sodium ion release, usually considered to be controlled by ion interdiffusion, and in later stages, usually attributed to dissolution of the silicate matrix. No temperature dependence was apparent. While diffusion processes quite probably influence initial leaching rates, they are unlikely to give rise to the observed isotope effect.
|Number of pages||5|
|Journal||Physics and Chemistry of Glasses|
|Publication status||Published - Feb 1987|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Ceramics and Composites