Abstract
Raman microprobe analysis was used to investigate the changes in the relative concentrations of oxygen and carbon dioxide found in bubbles in silicate glasses containing different amounts of arsenic oxide, sodium nitrate, and/or sodium nitrite after various heat treatments. As expected, analysis of the spectral data clearly indicated that addition of arsenic oxide to the glass accelerates the relative rate of oxygen dissolution with respect to carbon dioxide. Addition of either sodium nitrate or sodium nitrite to the glass composition containing arsenic oxide generates a relative rate of oxygen dissolution that is intermediate between those for the glass containing no refining agent and the silicate glass containing only arsenic oxide. This relative rate of oxygen dissolution is closely related to the amount of As3+ that is present in the glass.
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